create ... is temptable_name varchar2(20); v_count number(1); begin temptable_name := 'TEMP_TABLENAME'; select count(*) into v_count from tab where tname = temptable_name; if(v_count = 0) then execute immediate 'create table ...'; else --其他表存在的操作 end if; 2 注意使用...
使用select into会自动生成临时表,不需要事先创建 if OBJECT_ID('tempdb..#temp') is not null drop table #temp select * into #temp from sysobjects select * from #temp 1. 2. 3. 4. 1.2.2 insert-into 在现有表中插入新的数据。 1.3 option子句 先参考下面链接,暂时使用不多 https://www.imooc...
create table temp_1(account_no varchar(22)); 3、执行测试 (1) select fun_test(2); (2) select * from temp_1; 可以看到temp_1中没有插入数据,说明postgre的函数自带事务。当函数体内的任何一个操作或子函数抛出exception后,整个函数的操作都会回滚。
执行一个简单的create table语句,如果create table语句执行也很慢,说明存在IO/网络问题,进一步排查IO和网络 3. 系统表过大导致vacuum full慢 vacuum full任意一张表时,都会扫描pg_class、pg_partition、pg_proc三张系统表,当这三个系统表过大时,也会导致vacuum full较慢 可以在排除IO/网络问题(即create table语句...
CREATE TEMPORARY TABLE temp_table (id int,name varchar(50),age int )ON COMMIT PRESERVE ROWS;
lottu01=> create temp table lottu_t1 as SELECT * FROM dblink('host=192.168.1.221 port=6000 ...
DROP TABLE IF EXISTS tmp_table; CREATE TEMP TABLE tmp_table(id int4 primary key); INSERT INTO tmp_table SELECT user2role.userid::int4 AS id FROM user2role JOIN users ON users.id = user2role.userid JOIN role ON role.roleid = user2role.roleid Postgre+pgpool实现HA PostgreSQL HA 方案...
CREATETABLEmeasurement ( city_idintnotnull, logdatedatenotnull, peaktempint, unitsalesint); 主表是measurement表,就像上面那样声明 然后我们为每个月创建一个分区 CREATETABLEmeasurement_y2006m02 ( ) INHERITS (measurement);CREATETABLEmeasurement_y2006m03 ( ) INHERITS (measurement); ...
nik=# create table t1 as select 1 as id; SELECT 1 nik=# select ctid, xmin, xmax, * from t1; ctid | xmin | xmax | id ---+---+---+--- (0,1) | 47496 | 0 | 1 (1 row) nik=# update t1 set id = id where id = 1; UPDATE 1 nik=# select ctid, xmin, xmax, * ...
CREATETABLEparent1 (FirstColinteger);CREATETABLEparent2 (FirstColinteger, SecondColvarchar(20));CREATETABLEparent3 (FirstColvarchar(200));--子表child1将同时继承自parent1和parent2表,而这两个父表中均包含integer类型的FirstCol字段,因此child1可以创建成功。CREATETABLEchild1 (MyColtimestamp) INHERITS (...