using tablename as alias DELETE FROM tv_episodes USING tv_episodes AS ed LEFT OUTER JOIN data AS nd ON ed.file_name = nd.file_name AND ed.path = nd.path WHERE tv_episodes.id = ed.id AND ed.cd_name = 'MediaLibraryDrive' AND nd.cd_name IS NULL;…
In some case, we found that when we execute the sql commands like truncate table, drop table, delete all records in table, join 2 tables, it will take very very long time, and the execution is still in progress, no any result returned. Probably it is…
CREATE TABLE public.pgbench_accounts_bak ( aid integer NOT NULL, bid integer, abalance integer, filler character(84)); ALTER TABLE public.pgbench_accounts_bak OWNER TO postgres; ALTER TABLE ONLY public.pgbench_accounts_bak ADD CONSTRAINT pgbench_acco…
转自: https://docs.citusdata.com/en/v7.5/articles/outer_joins.html SQL is a very powerful language for analyzing and reporting against data. At the core of SQL is the idea of joins and how you combine various tables together. One such type of join: out…
Mysql 常用 SQL 语句集锦 基础篇 //查询时间,友好提示 $sql = "select date_format(create_time, '%Y-%m-%d') as day from table_name"; //int 时间戳类型 $sql = "select from_unixtime(create_time, '%Y-%m-%d') as day from table_name"; //一个sql返回多个总数 $sql = "select…
Mysql 常用 SQL 语句集锦 基础篇 //查询时间,友好提示 $sql = "select date_format(create_time, '%Y-%m-%d') as day from table_name"; //int 时间戳类型 $sql = "select from_unixtime(create_time, '%Y-%m-%d') as day from table_name"; //一个sql返回多个总数 $sql = "select…
