sql 如何应对子查询返回数据有多条　我就是要返回数据有多条

SELECT
	*
FROM
	SUSE_DEV.PROJECT_LISTING
INNER JOIN SUSE_DEV.PROJECT_AUCTION ON SUSE_DEV.PROJECT_LISTING.PROJECT_CODE on (
	SELECT
		*
	FROM
		SUSE_DEV.PROJECT_AUCTION
	WHERE
		SUSE_DEV.PROJECT_AUCTION.GMT_START > SYSDATE
)

这段ＳＱＬ里的子查询是肯定会返回多条的。一般来说，用ＯＮ是根本不能解决这样的问题，有些人说，可以用　

and rownum = 1

SELECT
	*
FROM
	SUSE_DEV.PROJECT_LISTING
INNER JOIN SUSE_DEV.PROJECT_AUCTION ON SUSE_DEV.PROJECT_LISTING.PROJECT_CODE on (
	SELECT
		*
	FROM
		SUSE_DEV.PROJECT_AUCTION
	WHERE
		SUSE_DEV.PROJECT_AUCTION.GMT_START > SYSDATE　and rownum = 1

)

这样只能处理返回的值的的确确只有一条的情况，那如果我要返回的有多条呢？答案就是用in

SELECT
	*
FROM
	SUSE_DEV.PROJECT_LISTING
INNER JOIN SUSE_DEV.PROJECT_AUCTION ON SUSE_DEV.PROJECT_LISTING.PROJECT_CODE IN (
	SELECT
		*
	FROM
		SUSE_DEV.PROJECT_AUCTI
IN
	WHERE
		SUSE_DEV.PROJECT_AUCTION.GMT_START > SYSDATE
)

这样就可以了。有人说用exists也可以，我没有试过。有兴趣大家可以试试。