问Postgres -在CASE内使用select语句EN非常复杂的结果集合，Mapper文件可能长这个样子，（注意当我们在selec...
CASE WHEN ujz.字段名=1 THEN (SELECT concat(jk.字段名,',',jk.字段名) from a表名称 jk ...
concat_ws('', t.typname, SUBSTRING(format_type(a.atttypid, a.atttypmod) from '\(.*\)')) as "属性", (case when a.attnotnull = true then 1 else 0 end) as 是否非空, (case when ( select count(pg_constraint.*) from pg_constraint inner join pg_class on pg_constraint.conrelid...
社区版,基于触发器 #operf --system-wide --lazy-conversion postgres=# insert into test2 select generate_series (19999000000,19999100000); INSERT 0 0 Time: 595721.715 ms # ctrl + c退出operf #opreport -l -f -g -w -x -t 0.01 /home/digoal/tmp_basedir_for_pgsql_bld/bin/postgres Using /h...
SELECT ROUND(1.38, 1), ROUND(1.38, 0), ROUND(232.38, -1), ROUND (232.38,-2); 5、符号函数SIGN(x) 使用SIGN函数返回参数的符号,输入语句如下: SELECT SIGN(-21),SIGN(0), SIGN(21); 6、幂运算函数POW(x,y)、POWER(x,y)和EXP(x) ...
SELECT/INSERT/UPDATE/DELETE/RULE/REFERENCES/TRIGGER has_table_privilege(table,privilege) 当前用户是否有访问表的权限 SELECT/INSERT/UPDATE/DELETE/RULE/REFERENCES/TRIGGER has_database_privilege(user,database,privilege) 用户是否有访问数据库的权限 CREATE/TEMPORARY has_database_privilege(database,privilege)...
Postgres-XL 10.1搭建 1、简介 Postgres-XL 一款开源的PG集群软件,XL代表eXtensible Lattice,即可扩展的PG“格子”之意。它是一个完全满足ACID的、开源的、可方便进行水平扩展的、多租户安全的、基于PostgreSQL的数据库解决方案。 与Pgpool
(pgstat_fetch_stat_bgwriter()->buf_alloc); } Datum pg_stat_get_bgwriter_stat_reset_time(PG_FUNCTION_ARGS) { PG_RETURN_TIMESTAMPTZ(pgstat_fetch_stat_bgwriter()->stat_reset_timestamp); } 还有一个select * from pg_stat_bgwriter ;可以看下这个视图的定义,它的信息综合了bgwriter,checkpointer,...
SELECTrelname,CASEwhen relkind = 'r' then 'tab'when relkind = 'i' then 'idx'when relkind = 'S' then 'seq'when relkind = 't' then 'toast'when relkind = 'v' then 'view'when relkind = 'm' then 'matview'when relkind = 'c' then 'composite'when relkind = 'f' then 'F ...
pg_replication:query: "SELECT CASE WHEN NOT pg_is_in_recovery() THEN 0 ELSE GREATEST (0, EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp())) END AS lag"master: truemetrics:- lag:usage: "GAUGE"description: "Replication lag behind master in seconds"pg_postmaster:query: "SELEC...