select * from emp where ename='SMITH';(字符串类型加单引号) 3.in(后面跟集合或者子查询) not in Like %:表示在这个%出现的地方可以有0个或者多个字符 _: 表示在_出现的地方有且只能一个任意字符 --查询emp表中员工姓名第三个字符是A的员工信息 select * from emp where ename like '__A%'; like...
# 模糊查询,extra_info ->> 'blacklistName'表示从json中取出key为blacklistName的元素 SELECT * FROM alarm WHERE is_deleted = 0 AND extra_info ->> 'blacklistName' like '%张三%' # 另一种写法,字符串精确查询 SELECT * FROM alarm WHERE is_deleted = 0 AND (extra_info @@ '$.blacklistId ...
Oracle优化器对于基数值的估算是否准确关系到能否生成最优的执行计划，而基数值估算的准确性又取决于SQL中...
schema_name); v_obj_name := array_append(v_obj_name, obj.object_name); if (obj.object_type = 'table') then have_table := true; end if; END LOOP; if ( have_table = true ) then RAISE NOTICE 'Move table to recycle bin'; RAISE exception 'Found table in drop list.'; end if...
Step 1: In the App Service page: From the left menu, select Overview. Select the URL of your app. Step 2: Add a few restaurants to the list. Congratulations, you're running a web app in Azure App Service, with secure connectivity to Azure Database for PostgreSQL. 7. Stream diagnostic...
AND tablename NOT LIKE 'sql_%' ORDER BY tablename; 列出数据库名 \l 或 SELECT datname FROM pg_database; 切换数据库 \c 数据库名 1、通过命令行查询 \d 数据库 —— 得到所有表的名字 \d 表名 —— 得到表结构 2、通过SQL语句查询
# The complete list of parameter names and allowed values can be found in the # pgPool-II documentation. # # This file is read on server startup and when the server receives a SIGHUP # signal. If you edit the file on a running system, you have to SIGHUP the # server for the ch...
The good news is that ifstrcmpchanges in some breaking way, we’ll all have a lot more to worry about than PostgreSQL collation (like Linux not working anymore). Remember that if you have non-7-bit-ASCII characters, they’ll collate in some unfortunate way. ...
Select your database: In the Connect blade, you find a dropdown list of your databases. Select the database you wish to perform a dump from. Choose the appropriate method: Depending on your database size, you can choose between two methods: pg_dump & psql - using singular text file**...
ts timestamp NOT NULL, data text )PARTITION BY LIST((ts::date)); CREATE TABLE tab_def PARTITION OF tab DEFAULT; 分区的创建一般分以下两种场景: 一、定时提前创建分区 定时提前创建分区只需一个定时任务调度工具即可实现,常见的定时任务调度工具和创建分区方法如下: ...