PgSQl临时表创建及应用实例解析

(编辑:jimmy 日期: 2024/11/13 浏览:2)

创建前可先删除

drop table tmp0

创建临时表

select * into temp table tmp0 from xxx create index idx_tmp0_inner_cd on tmp0(inner_cd);

查看临时表是否创建,返回0表示未创建,1为创建

select count(*) from pg_class where relname = 'tmp0' 

或者用下面,下面语句在pg和mysql中都适用

Create Table If Not Exists temp.MyTable(
xxx varchar (20) Primary key ,
thTime varchar (20) ,
name varchar (20)
)

同样可以用在删除表中:

DROP TABLE If Exists temp.mjp_temp_update_log

应用例子:

SELECT
  ids,
  code,
   INTO TEMP TABLE tmp0
FROM
  TEMP .m_product_x
WHERE
  TEMP .m_product_x.ids = ''
GROUP BY
  TEMP .m_product_x.code,
  TEMP .m_product_x.ids;
 
CREATE INDEX idx_tmp0_inner_cd ON tmp0 (code);
 
SELECT
*
FROM
  TEMP .m_product
INNER JOIN tmp0 ON TEMP .m_product.code = tmp0.code
WHERE
  TEMP .m_product.ids = ''
ORDER BY
  tmp0.xx,
  tmp0.ss;
DROP TABLE tmp0;

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。