'::text) - Bitmap Index Scan on gin_mul_gin_idx (cost=0.00..20.01 rows...d9969c8b66402c9b7d17a6d5b7d3'::text) (6 rows)两个字段组合索引teledb=# explain select * from gin_mul where f1=2 and f3='2019-02-18 16:59:52.872523'; QUERY
'::text) - Bitmap Index Scan on gin_mul_gin_idx (cost=0.00..20.01 rows...d9969c8b66402c9b7d17a6d5b7d3'::text) (6 rows) 两个字段组合索引 teledb=# explain select * from gin_mul where f1=2 and f3='2019-02-18 16:59:52.872523'; QUERY
'::text) - Bitmap Index Scan on gin_mul_gin_idx (cost=0.00..20.01 rows...d9969c8b66402c9b7d17a6d5b7d3'::text) (6 rows)两个字段组合索引teledb=# explain select * from gin_mul where f1=2 and f3='2019-02-18 16:59:52.872523'; QUERY
'::text) - Bitmap Index Scan on gin_mul_gin_idx (cost=0.00..20.01 rows...d9969c8b66402c9b7d17a6d5b7d3'::text) (6 rows)两个字段组合索引teledb=# explain select * from gin_mul where f1=2 and f3='2019-02-18 16:59:52.872523'; QUERY
'::text) - Bitmap Index Scan on gin_mul_gin_idx (cost=0.00..20.01 rows...d9969c8b66402c9b7d17a6d5b7d3'::text) (6 rows)两个字段组合索引teledb=# explain select * from gin_mul where f1=2 and f3='2019-02-18 16:59:52.872523'; QUERY
'::text) - Bitmap Index Scan on gin_mul_gin_idx (cost=0.00..20.01 rows...d9969c8b66402c9b7d17a6d5b7d3'::text) (6 rows)两个字段组合索引teledb=# explain select * from gin_mul where f1=2 and f3='2019-02-18 16:59:52.872523'; QUERY
sudo hostname 【示例】假设查询的主机名如下: ecm-53a1:ecm-53a1 ecm-9d59:ecm-9d59 建立主机名与IP地址之间的映射关系,并添加同一VPC内其他弹性云主机的信息。 a. 登录弹性云主机ecm-53a1。 b. 执行以下命令,切换至root权限。 sudo su - c. 执行以下命令,编辑hosts文件。 vi /etc/hosts d. 按“ i ”,进入编辑模式。 e. 按照如下格式添加语句,建立映射关系。
, SUM(CASE WHEN (d_day_name='Monday') THEN ss_sales_price ELSE null END) mon_sales, SUM(CASE WHEN (d_day_name='Tuesday') THEN ss_sales_price ELSE null END) tue_sales, SUM(CASE WHEN (d_day_name='Wednesday') THEN ss_sales_price ELSE null END) wed_sales,