本文介绍如何在使用SELECT语法时进行聚合函数并发计算。 plaintext teledb set maxparallelworkerspergather to 0; SET Time: 0.214 ms teledb select count(1) from tcount; count 20000000 (1 row) Time: 2700.569 ms (00:02.701) teledb set maxparallelworkerspergather to 2; SET Time: 0.269 ms teledb select count(1) from tcount; count 20000000 (1 row) Time: 1867.719 ms (00:01.868)

本文为您介绍如何修改数据库配置。 修改数据库名称 plaintext teledb alter database teledbdb rename to teledbdbnew; ALTER DATABASE 修改连接数 plaintext teledb alter database teledbdbnew connection limit 50; ALTER DATABASE 修改数据库所有者 plaintext teledb alter database teledbdbnew owner to teledb; ALTER DATABASE 配置数据默认searchpath plaintext teledb alter database teledbdbnew set searchpath to public, pgcatalog; ALTER DATABASE alter database不支持修改的项目 项目 备注 encoding 编码 lccollate 排序规则 lcctype 分组规则

与SQL Server对照表 SQL Server TeleDB int int smallint smallint bigint bigint tinyint smallint real real float double precision numeric numeric bit bit char char nchar char varchar varchar nvarchar varchar text text ntext text date date time time datetime timestamp datetime2 timestamp smalldatetime timestamp datetimeoffset timestamp uniqueidentifier uuid image bytea binary bytea varbinary bytea

drop index tsexsexidx; DROP INDEX teledb create index tsexsexidx on tsex (sex) where sex '女'; CREATE INDEX teledb analyze tsex; ANALYZE teledb explain select from tsex where sex '男'; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Seq Scan on tsex (cost0.00..9966.58 rows500539 width8) Filter: (sex '男'::text) (4 rows) teledb explain select from tsex where sex '女'; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Index Scan using tsexsexidx on tsex (cost0.14..13.15 rows67 width8) (3 rows) teledb q [teledb@localhost bin]$ ./telesql p 22222 U teledb d teledb Password for user teledb: telesql (TeleDB V6) Type "help" for help. teledb di+ tsexsexidx List of relations Schema Name Type Owner Table Size Allocated Size Description +++++++ public tsexsexidx index teledb tsex 16 kB 16 kB (1 row)

本页介绍天翼云TeleDB数据库修改存储过程名称的语法。 修改不带参数的存储过程名称 plaintext teledb CREATE OR REPLACE PROCEDURE proc1() AS $$ begin raise notice 'Hello telebdxpg'; end; $$ LANGUAGE PLPGSQL; CREATE PROCEDURE teledb alter procedure proc1() rename to proc11; ALTER PROCEDURE teledb 修改带参数的存储过程名称 plaintext teledb CREATE OR REPLACE PROCEDURE proc1(aint int) AS $$ begin raise notice '%',aint; end; $$ LANGUAGE PLPGSQL; CREATE PROCEDURE teledb alter procedure proc1 (aint int) rename to proc11; ALTER PROCEDURE

本文为您介绍如何通过SELECT语法访问函数。 plaintext teledb select md5(random()::text); md5 ed5b356234979a63efc6c4f6537c4853 (1 row)

本页介绍天翼云TeleDB数据库Oracle语法中的统计函数。 listagg plaintext listagg (filedname,',') WITHIN GROUP (ORDER BY filedname) 行转列函数。 plaintext teledb create table person teledb ( teledb( deptno varchar2(10), teledb( ename varchar(20) teledb( ); CREATE TABLE teledb insert into person values('20','aaa'); INSERT 0 1 teledb teledb insert into person values('20','bbb'); INSERT 0 1 teledb teledb insert into person values('20','ccc'); INSERT 0 1 teledb teledb insert into person values('21','ddd'); INSERT 0 1 teledb teledb insert into person values('21','eee'); INSERT 0 1 teledb select teledb deptno, teledb listagg (ename,',') WITHIN GROUP (ORDER BY ENAME) teledb from teledb person teledb group by teledb deptno ; deptno listagg + 20 aaa,bbb,ccc 21 ddd,eee (2 rows)

本页介绍天翼云TeleDB数据库Oracle语法中的二进制操作函数。 emptyclob 需要加载插件teledbxoraclepackagefunction plaintext create extension teledboraclepackagefunction; 初始化CLOB 字段。 plaintext teledb select emptyclob(); emptyclob (1 row) teledb create table t1 (f1 int,f2 clob); CREATE TABLE teledb insert into t1(f1,f2) values (1,emptyclob()); INSERT 0 1 teledb

本页介绍天翼云TeleDB数据库Oracle语法中的转换函数。 toclob 转换字符为clob类型。 plaintext teledb select toclob('teledb') from dual; toclob teledb (1 row) teledb ROWIDTOCHAR 转换rowid值为varchar2类型。 plaintext teledb d+ trowid Table "public.trowid" Column Type Collation Nullable Default Storage Stats target Descripti on +++++++ f1 integer plain f2 integer plain Has ROWIDs: yes Distribute By: SHARD(f1) Location Nodes: ALL DATANODES teledb SELECT ROWIDTOCHAR(rowid),rowid from trowid; rowidtochar rowid + XPK3fwAQAAAAAAAAA XPK3fwAQAAAAAAAAA (1 row) teledb CHARTOROWID CHARTOROWID(c1) 转换varchar2类型为rowid值，c1，字符串，长度为20的字符串，字符串必须符合rowid 格式。 plaintext teledb select CHARTOROWID('AAAFd1AAFAAAABSACCAA') a1 from dual; a1 AAAFdwFAAAABSACCA (1 row) teledb

create table tnlssort(f1 integer,f2 varchar2(10)); CREATE TABLE teledb insert into tnlssort values(1,'天翼云'); INSERT 0 1 teledb insert into tnlssort values(2,'广州'); INSERT 0 1 teledb insert into tnlssort values(3,'中国'); INSERT 0 1 teledb SELECT FROM tnlssort ORDER BY NLSSORT(f2,'NLSSORT SCHINESEPINYINM'); f1 f2 + 1 天翼云 3 中国 2 广州 (3 rows) teledb 目前TeleDB只能支持按拼音。 nlsupper 将字符转换为大写。 plaintext teledb select NLSUPPER('teledb','nlssort SCHINESEPINYINM') from dual; nlsupper TELEDB (1 row) teledb nchr 给出一个数字代码，返回其对应字符。 plaintext teledb select NCHR(116) from dual; nchr t (1 row) teledb length 获取字符长度。 plaintext teledb select length(1); length 1 (1 row) teledb select length('teledb'); length 7 (1 row) teledb select length('阿弟'); length 2 (1 row) teledb select length(12.12::numeric(10,2)); length 5 (1 row) teledb LENGTHB 返回字符的长度。 plaintext teledb select LENGTHB('测试') from dual; lengthb 6 (1 row) teledb select LENGTH('测试') from dual; length 2 (1 row) teledb

本页介绍天翼云TeleDB数据库Oracle语法中的日期函数。 NUMTODSINTERVAL numtodsinterval( , ) x是一个数字、c是一个字符串，表明x的单位，这个函数把x转为interval day to second数据类型。 plaintext teledb select sysdate,sysdate+numtodsinterval(2,'hour') as res from dual; orclsysdate res + 20230824 10:49:53.417051 20230824 12:49:53.417051 (1 row) teledb DBTIMEZONE plaintext teledb select DBTIMEZONE from dual; dbtimezone 08:00:00 (1 row) teledb MONTHSBETWEEN plaintext teledb select monthsbetween(todate('20210331', 'yyyymmdd'), todate('20200131', 'yyyymmdd')) as months from dual; months 14 (1 row) teledb LASTDAY LASTDAY函数返回指定日期对应月份的最后一天。 plaintext teledb SELECT lastday('20200501') FROM dual; lastday 20200531 00:00:00+08 (1 row) teledb ADDMONTHS ADDMONTHS(x,y) x值为日期，y值为数量，用于计算某个日期向前或者向后y个月后的时间。 plaintext teledb select addmonths(sysdate,1) from dual; addmonths 20230924 11:08:17.194487 (1 row) teledb select addmonths(sysdate,1) from dual; addmonths 20230724 11:08:21.019573 (1 row) teledb

END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f27(1,'teledbpg'); NOTICE: 错误代码 : 23505 NOTICE: 出错信息 : node:16385, error duplicate key value violates unique constraint "texceptioniduidx" NOTICE: 发生异常语句 : SQL statement "INSERT INTO texception VALUES(aid,anc)" PL/pgSQL function f27(integer,text) line 7 at SQL statement f27 错误代码 : 23505n出错信息 : node:16385, error duplicate key value violates unique constraint "texceptioniduidx"发生异常语句 : SQL statement "INSERT INTO texception VALUES(aid,anc)"+ PL/pgSQL function f27(integer,text) line 7 at SQL statement (1 row)

limit x offset 1 如果参数enableoraclecompatible配置为on，则offset 1表示从第一条提取记录。 plaintext teledb select from test1; id name + 1 test1 2 test2 3 test2 4 test2 5 test2 (5 rows) teledb select from test1 limit 5 offset 1; id name + 1 test1 2 test2 3 test2 4 test2 5 test2 teledb dml 操作加强 select支持别名不用as修饰 plaintext teledb create table student(f1 int,f2 int); CREATE TABLE teledb insert into student values(1,1); INSERT 0 1 teledb select from student as st where st.f11; f1 f2 + 1 2 (1 row) teledb select from student st where st.f11; f1 f2 + 1 2 update支持别名 需要打开enableoraclecompatible plaintext teledb set enableoraclecompatible to on; SET teledb create table student(f1 int,f2 int); CREATE TABLE teledb insert into student values(1,1); INSERT 0 1 teledb update student st set st.f22 where f11; UPDATE 1 teledb select from student ; f1 f2 + 1 2 实际 teledb UPDATE student st SET st.f2 2 WHERE st.f1 1; ERROR: column "st" of relation "student" does not exist LINE 2: SET st.f2 2

CREATE OR REPLACE FUNCTION f25() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vtxt1 TEXT COLLATE "C" : '天'; teledb$ vtxt2 TEXT COLLATE "C" : '翼'; teledb$ BEGIN teledb$ IF vtxt1 > vtxt2 THEN teledb$ RAISE NOTICE ' % > % ',vtxt1,vtxt2; teledb$ ELSE teledb$ RAISE NOTICE ' % > % ',vtxt2,vtxt1; teledb$ END IF; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f25(); NOTICE: 翼 > 天 f25 (1 row) teledb select '天'::bytea; bytea xe5a4a9 (1 row) teledb select '翼'::bytea; bytea xe7bfbc (1 row) teledb 按汉字的拼音对比大小。 plaintext teledb CREATE OR REPLACE FUNCTION f25() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vtxt1 TEXT COLLATE "zhCN.utf8" : '天'; teledb$ vtxt2 TEXT COLLATE "zhCN.utf8" : '翼'; teledb$ BEGIN teledb$ IF vtxt1 > vtxt2 THEN teledb$ RAISE NOTICE ' % > % ',vtxt1,vtxt2; teledb$ ELSE teledb$ RAISE NOTICE ' % > % ',vtxt2,vtxt1; teledb$ END IF; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f25(); NOTICE: 翼 > 天 f25 (1 row)

本页介绍天翼云TeleDB数据库PL/pgsql控制结构中的循环语句。 LOOP 循环 plaintext teledb CREATE OR REPLACE FUNCTION f27() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vid INTEGER : 1; teledb$ BEGIN teledb$ LOOP teledb$ RAISE NOTICE '%',vid; teledb$ EXIT WHEN random()>0.8; teledb$ vid : vid + 1; teledb$ END LOOP ; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f27(); NOTICE: 1 NOTICE: 2 f27 (1 row) 使用EXIT退出循环。 plaintext teledb CREATE OR REPLACE FUNCTION f27() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vid INTEGER : 1; teledb$ vrandom float8 ; teledb$ BEGIN teledb$ LOOP teledb$ RAISE NOTICE '%',vid; teledb$ vid : vid + 1; teledb$ vrandom : random(); teledb$ IF vrandom > 0.8 THEN teledb$ RETURN; teledb$ END IF; teledb$ END LOOP ; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb SELECT f27(); NOTICE: 1 NOTICE: 2 NOTICE: 3 NOTICE: 4 NOTICE: 5 f27 (1 row) teledb 使用RETURN退出循环返回。 WHILE循环 plaintext teledb CREATE OR REPLACE FUNCTION f27() RETURNS VOID AS teledb $$ teledb$ DECLARE teledb$ vid INTEGER : 1; teledb$

UPDATE ttrigger SET nc'teledbpg' WHERE id1; UPDATE 1 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 (1 row) teledb DELETE事件触发器函数 限制teledbpg记录不能被删除。 plaintext teledb CREATE OR REPLACE FUNCTION ttriggerdeletetriggerfunc() RETURNS trigger AS teledb $$ teledb$ BEGIN teledb$ 不准许ttrigger.nc值为 teledbpg teledb$ IF OLD.nc 'teledbpg' THEN teledb$ RETURN NULL; teledb$ RAISE EXCEPTION 'teledbpg不能被删除'; teledb$ END IF; teledb$ RETURN OLD; teledb$ END; teledb$ $$ teledb LANGUAGE plpgsql; CREATE FUNCTION teledb CREATE TRIGGER ttriggerdeletetrigger BEFORE DELETE ON ttrigger FOR EACH ROW EXECUTE PROCEDURE ttriggerdeletetriggerfunc(); CREATE TRIGGER teledb INSERT INTO ttrigger VALUES(2,'teledbpg'); INSERT 0 1 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 2 teledbpg (2 rows) teledb DELETE FROM ttrigger WHERE id2; DELETE 0 teledb SELECT FROM ttrigger ; id nc + 1 teledbpg0.426093454472721 2 teledbpg (2 rows) 删除触发器 plaintext teledb drop TRIGGER ttriggerinserttrigger on ttrigger; DROP TRIGGER 触发器使用限制 分区表，冷热分区表和复制表不支持使用触发器。

本页介绍天翼云TeleDB数据库PL/pgsql函数的返回值。 返回值可以是一个简单数据类型、复合类型、RECORD、已经存在的表行类型、表字段类型、游标、另外还可以返回一个记录集、如果不需要返回值，则可以用RETURN void。返回值的字段名及类型可以在参数OUT、INOUT模式中声明。

定义游标 plaintext teledb begin; BEGIN teledb DECLARE teledbcur SCROLL CURSOR FOR SELECT from bills ORDER BY id; DECLARE CURSOR 注意 游标需要放在一个事务中使用。 提取下一行数据 plaintext teledb DECLARE teledbcur SCROLL CURSOR FOR SELECT from bills ORDER BY id; DECLARE CURSOR teledb FETCH NEXT from teledbcur; id goodsdesc beginunit begincity pubtime amount +++++ 1 衣服 海南省 三亚市 20151005 09:32:01 3714.15 (1 row) teledb FETCH NEXT from teledbcur; id goodsdesc beginunit begincity pubtime amount +++++ 2 建筑设备 福建省 三明市 20151005 07:21:22 8195.98 (1 row) 提取前一行数据 plaintext teledb FETCH PRIOR from teledbcur; id goodsdesc beginunit begincity pubtime amount +++++ 1 衣服 海南省 三亚市 20151005 09:32:01 3714.15 (1 row) teledb FETCH PRIOR from teledbcur; id goodsdesc beginunit begincity pubtime amount +++++ (0 rows) 提取最后一行 plaintext teledb fetch last from teledbcur; id goodsdesc beginunit begincity pubtime amount +++++ 11 普货40吨需13米半挂一辆 上海市 上海市 20151005 08:13:59 1425.64 (1 row)

show searchpath; searchpath "$user", public (1 row) teledb select pgnamespace.nspname,pgproc.prosrc from pgproc,pgnamespace where teledb pgproc.pronamespacepgnamespace.oid and pgproc.proname'f'; nspname prosrc + public + BEGIN + RAISE NOTICE 'Hello ,teledb';+ END; + (1 row) 因为$user模式不存在，所以存在public模式下。

本文为您介绍jsonb应用的相关操作。 创建jsonb类型字段表 plaintext teledb create table tjsonb(id int,fjsonb jsonb); CREATE TABLE 插入数据 plaintext teledb insert into tjsonb values(1,'{"col1":1,"col2":"teledb"}'); INSERT 0 1 teledb insert into tjsonb values(2,'{"col1":1,"col2":"teledb","col3":"pgxz"}'); INSERT 0 1 teledb select from tjsonb; id fjsonb + 1 {"col1": 1, "col2": "teledb"} 2 {"col1": 1, "col2": "teledb", "col3": "pgxz"} (2 rows jsonb插入时会移除重复的键，如下所示。 plaintext teledb insert into tjsonb values(3,'{"col1":1,"col2":"teledb","col2":"pgxz"}'); INSERT 0 1 teledb select from tjsonb; id fjsonb + 1 {"col1": 1, "col2": "teledb"} 2 {"col1": 1, "col2": "teledb", "col3": "pgxz"} 3 {"col1": 1, "col2": "pgxz"} (3 rows) 更新数据 增加元素。 plaintext teledb update tjsonb set fjsonb fjsonb '{"col3":"pgxz"}'::jsonb where id1; UPDATE 1 teledb select from tjsonb; id fjsonb + 2 {"col1": 1, "col2": "teledb", "col3": "pgxz"} 1 {"col1": 1, "col2": "teledb", "col3": "pgxz"} 3 {"col1": 1, "col2": "pgxz"} (3 rows) 更新原来的元素。 plaintext teledb

create table trowlock(id int,mc text,primary key (id)) distribute by shard(id); CREATE TABLE teledb insert into trowlock values(1,'teledb'),(2,'pgxz'); COPY 2 teledb select from trowlock; id mc + 1 teledb 2 pgxz (2 rows) 直接update 获取 会话1 plaintext teledb begin; BEGIN teledb set locktimeout to 1; SET teledb update trowlock set mc'teledb' where mc'pgxz'; UPDATE 1 会话2 plaintext teledb begin; BEGIN teledb set locktimeout to 1; SET teledb update trowlock set mc'teledb' where mc'pgxz'; UPDATE 1 teledb update trowlock set mc'postgresql' where mc'pgxz'; ERROR: node:dn01, backendpid:10158, nodename:dn01,backendpid:10158,message:canceling statement due to lock timeout 上面session1与session2分别持有mcpgxz行和mcteledb的行锁 会话1提交事务 plaintext teledb commit; COMMIT 会话2重新更新 plaintext teledb commit; ROLLBACK teledb update trowlock set mc'postgresql' where mc'pgxz'; UPDATE 0 teledb update trowlock set mc'postgresql' where mc'teledb'; UPDATE 1 select...for update 获取 会话1 plaintext teledb begin; BEGIN teledb set locktimeout to 1; SET teledb select from trowlock where mc'postgresql' for update; id mc + 2 postgresql (1 row) 会话2 plaintext teledb

本页介绍天翼云TeleDB数据库的游标使用方法。 环境准备 plaintext drop table if exists bills ; create table bills ( id serial not null, goodsdesc text not null, beginunit text not null, begincity text not null, pubtime timestamp not null, amount float8 not null default 0, primary key (id) ) distribute by shard(id) to group defaultgroup; COMMENT ON TABLE bills is '运单记录'; COMMENT ON COLUMN bills.id IS 'id号'; COMMENT ON COLUMN bills.goodsdesc IS '货物名称'; COMMENT ON COLUMN bills.beginunit IS '启运省份'; COMMENT ON COLUMN bills.begincity IS '启运城市'; COMMENT ON COLUMN bills.pubtime IS '发布时间'; COMMENT ON COLUMN bills.amount IS '运费'; INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'衣服','海南省','三亚市','20151005 09:32:01',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'建筑设备','福建省','三明市','20151005 07:21:22',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'设备','福建省','三明市','20151005 11:21:54',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'普货','福建省','三明市','20151005 15:19:17',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'5 0铲车，后八轮翻斗车','河南省','三门峡市','20151005 07:53:13',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'鲜香菇2000斤','河南省','三门峡市','20151005 10:38:29',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'旋挖附件38吨','河南省','三门峡市','20151005 10:48:38',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'旋挖附件35吨','河南省','三门峡市','20151005 10:48:38',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'旋挖附件39吨','河南省','三门峡市','20151005 11:38:38',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'设备','上海市','上海市','20151005 07:59:35',ROUND((random()10000)::NUMERIC,2)); INSERT INTO bills(id,goodsdesc,beginunit,begincity,pubtime,amount) VALUES(default,'普货40吨需13米半挂一辆','上海市','上海市','20151005 08:13:59',ROUND((random()10000)::NUMERIC,2));

本文为您介绍如何删除索引。 plaintext teledb drop index tmulidxidx; DROP INDEX

alter table t owner to user1; ALTER TABLE teledb dt t List of relations Schema Name Type Owner +++ teledb t table user1 (1 row) 修改字段名 plaintext teledb d+ t Table "teledb.t" Column Type Collation Nullable Default Storage Stats target Description +++++++ id integer not null plain mc text extended Indexes: "tpkey" PRIMARY KEY, btree (id) Distribute By: SHARD(id) Location Nodes: ALL DATANODES teledb alter table t rename mc to nickname; ALTER TABLE teledb d+ t Table "teledb.t" Column Type Collation Nullable Default Storage Stats target Description +++++++ id integer not null plain nickname text extended Indexes: "tpkey" PRIMARY KEY, btree (id) Distribute By: SHARD(id) Location Nodes: ALL DATANODES

本文为您介绍如何使用多字段索引。 plaintext teledb create table tmulidx (f1 int,f2 int,f3 int,f4 int); CREATE TABLE teledb create index tmulidxidx on tmulidx(f1,f2,f3); CREATE INDEX 多字段使用注意事项： or 查询条件 bitmap scan 最多支持两个不同字段条件。 plaintext teledb insert into tmulidx select t,t,t,t from generateseries(1,1000000) as t; INSERT 0 1000000 teledb analyze ; ANALYZE teledb explain select from tmulidx where f11 or f22 ; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn001, dn002 > Bitmap Heap Scan on tmulidx (cost7617.08..7621.07 rows2 width16) Recheck Cond: ((f1 1) OR (f2 2)) > BitmapOr (cost7617.08..7617.08 rows2 width0) > Bitmap Index Scan on tmulidxidx (cost0.00..2.43 rows1 width0) Index Cond: (f1 1) > Bitmap Index Scan on tmulidxidx (cost0.00..7614.65 rows1 width0) Index Cond: (f2 2) (9 rows) Time: 5.134 ms teledb explain select from tmulidx where f11 or f22 or f13 ; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn001, dn002 > Bitmap Heap Scan on tmulidx (cost7619.51..7625.49 rows3 width16) Recheck Cond: ((f1 1) OR (f2 2) OR (f1 3)) > BitmapOr (cost7619.51..7619.51 rows3 width0) > Bitmap Index Scan on tmulidxidx (cost0.00..2.43 rows1 width0) Index Cond: (f1 1) > Bitmap Index Scan on tmulidxidx (cost0.00..7614.65 rows1 width0) Index Cond: (f2 2) > Bitmap Index Scan on tmulidxidx (cost0.00..2.43 rows1 width0) Index Cond: (f1 3) (11 rows) Time: 5.048 ms teledb

本文为您介绍如何管理表达式索引。 plaintext teledb create table tupper(id int,mc text); CREATE TABLE teledb create index tuppermc on tupper(mc); CREATE INDEX teledb insert into tupper select t,md5(t::text) from generateseries(1,10000) as t; INSERT 0 10000 teledb analyze tupper; ANALYZE teledb explain select from tupper where upper(mc)md5('1'); QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Seq Scan on tupper (cost0.00..133.58 rows25 width37) Filter: (upper(mc) 'c4ca4238a0b923820dcc509a6f75849b'::text) (4 rows) teledb create index tuppermc on tupper(upper(mc)); ERROR: relation "tuppermc" already exists teledb create index tuppermc1 on tupper(upper(mc)); CREATE INDEX teledb explain select from tupper where upper(mc)md5('1'); QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Bitmap Heap Scan on tupper (cost4.48..50.94 rows25 width37) Recheck Cond: (upper(mc) 'c4ca4238a0b923820dcc509a6f75849b'::text) > Bitmap Index Scan on tuppermc1 (cost0.00..4.47 rows25 width0) Index Cond: (upper(mc) 'c4ca4238a0b923820dcc509a6f75849b'::text) (6 rows)

本文为您介绍如何使用查询结果创建数据表。 plaintext teledb insert into t values(1,'teledb'); INSERT 0 1 teledb create table tas as select from t; INSERT 0 1 teledb select from tas; id mc + 1 teledb (1 row)

本文为您介绍如何管理普通索引。 plaintext teledb create index tididx on t1 using btree(id); CREATE INDEX

RAISE NOTICE 'aint[1] %',aint[1]; teledb$ RAISE NOTICE 'axm %',axm; teledb$ END; teledb$ $$ teledb LANGUAGE PLPGSQL; CREATE FUNCTION teledb teledb select f1('teledb',1,2); NOTICE: aint {1,2} NOTICE: aint[1] 1 NOTICE: axm teledb f1 (1 row)

本文为您介绍如何添加分区子表。 plaintext teledb d+ trange Table "public.trange" Column Type Collation Nullable Default Storage Stats target Description +++++++ f1 bigint plain f2 timestamp without time zone now() plain f3 integer plain Distribute By: SHARD(f1) Location Nodes: ALL DATANODES Partition By: RANGE(f3) Of Partitions: 3 Start With: 1 Interval Of Partition: 50 teledb alter table trange add partitions 2; ALTER TABLE teledb d+ trange Table "public.trange" Column Type Collation Nullable Default Storage Stats target Description +++++++ f1 bigint plain f2 timestamp without time zone now() plain f3 integer plain Distribute By: SHARD(f1) Location Nodes: ALL DATANODES Partition By: RANGE(f3) Of Partitions: 5 Start With: 1 Interval Of Partition: 50

本页介绍天翼云TeleDB数据库存储过程名的语法。 建立存储过程，模式名可以指定，也可以不指定，不指定则存放在当前模式下，如上面例子就没有指定模式名，则就存放在当前模式下，如下所示。 plaintext teledb select from pgnamespace; nspname nspowner nspacl ++ pgtoast 10 pgtemp1 10 pgtoasttemp1 10 pgcatalog 10 {teledbUC/teledb,U/teledb} public 10 {teledbUC/teledb,UC/teledb} informationschema 10 {teledbUC/teledb,U/teledb} (6 行记录) teledb show searchpath; searchpath "$user",public (1 行记录) teledb select pgnamespace.nspname,pgproc.prosrc from pgproc,pgnamespace where pgproc.pronamespacepgnamespace.oid and pgproc.proname'proc1'; nspname prosrc + public + begin + raise notice 'Hello，teledbpg';+ end; + (1 row) 因为$user模式不存在，所以存在public模式下。

本文为您介绍如何指定模式创建表。 plaintext teledb create table public.t1(id int,mc text); CREATE TABLE