PgSQl臨時表的創建

創建前可先刪除

drop table tmp0 

創建臨時表

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

　　查看臨時表是否創建，返回0表示未創建，1為創建

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

　

或者用下面，下面語句在pg和mysql中都適用

Create Table If Not Exists temp.MyTable(

xxx varchar (20) Primary key ,

thTime varchar (20) ,

name  varchar (20)

)

 同樣可以用在刪除表中：

DROP TABLE  If  Exists temp.mjp_temp_update_log

 

應用例子：

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;