SELECTfirst_name,last_name,salaryFROMemployeesorderbysalarydescOFFSET10ROWSfetchfirst10rowsonly; OFFSET表示先忽略掉多少行数据,然后再返回后面的结果。ROWS也可以写成ROW。对于应用程序而言,只需要传入不同的OFFSET偏移量和FETCH数量,就可以在结果中任意导航。使用LIMIT
SELECT first_name, last_name, salary FROM employees ORDER BY salary DESC OFFSET 10 ROWS FETCH FIRST 10 ROWS ONLY; first_name|last_name|salary | ---|---|---| Gerald |Cambrault|11000.00| Den |Raphaely |11000.00| Ellen |Abel |11000.00| Clara |Vishney |10500.00| Eleni |Zlotkey ...
Note that the FETCH clause was introduced as a part of the SQL standard in SQL:2008. The following illustrates the syntax of the PostgreSQL FETCH clause: OFFSET row_to_skip { ROW | ROWS } FETCH { FIRST | NEXT } [ row_count ] { ROW | ROWS } ONLY In this syntax: First, specify ...
去验证用户名与密码 3.验证成功后，服务端会签发一个 Token，再把这个 Token 发送给客户端 4.客户端...
[ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY ] [ FOR { UPDATE | NO KEY UPDATE | SHARE | KEY SHARE } [ OF table_name [, ...] ] [ NOWAIT | SKIP LOCKED ] [...] ] from_item 可以是以下选项之一: [ ONLY ] table_name [ * ] [ [ AS ]alias[ ( column_alia...
{ FIRST | LAST } ] [, ...] ] [ LIMIT { count | ALL } ] [ OFFSET start [ ROW | ROWS ] ] [ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY ] [ FOR { UPDATE | NO KEY UPDATE | SHARE | KEY SHARE } [ OF table_name [, ...] ] [ NOWAIT | SKIP LOCKED ]...
id | info | crt_time —-+——–+———- 3 | digoal | 2013-03-10 17:33:32.91286 3 | digoal | 2013-03-10 17:34:17.854048 (2 rows) – 返回空, 不会执行delete操作, 如下 postgres=# CREATE OR REPLACE FUNCTION public.tg_t_ret() RETURNS trigger LANGUAGE plpgsql AS functionfunction ...
LIMIT vs. FETCH FIRST ROWS Before we dig into some of the more advanced features we need to see howLIMITandFETCH FIRST ROWScan be used. To demonstrate this feature, I have compiled a simple data set: 1 2 3 4 5 6 7 8 9 10
查询第6行到第10行的记录-- fetch子句-- 层次化查询 查询员工之间的领导关系,职位由高到低排列 常用模式对象 模式对象 视图 create view权限(自己模式中创建视图) create any view权限(其他模式中创建视图) 创建一个包含员工基本信息,并按员工升序排序的员工基本信息视图-- ...
[ FETCH { FIRST | NEXT } [count] { ROW | ROWS } ONLY ] Description VALUEScomputes a row value or set of row values specified by value expressions. It is most commonly used to generate a"constant table" within a larger command, but it can be used on its own. ...