sql-對一張表操作

返回可審批的id

SELECT ID FROM 
(SELECT
	MAX(ID) ID,APPLICATION_TIME,COUNT(*) NUM
FROM
	CRD_STA_APPROVAL 
WHERE
	ORGANIZATION_CODE = 0000
	AND POSITION_LEVEL <= 1
	AND APPROVE_RESULT = 3 
GROUP BY
	APPLICATION_TIME) a
	WHERE a.NUM=1

返回不可審批的信息

SELECT * FROM CRD_STA_APPROVAL WHERE APPROVE_RESULT <2

返回不可審批的id

SELECT
	ID
FROM
	CRD_STA_APPROVAL b
	INNER JOIN ( SELECT APPLICATION_TIME FROM CRD_STA_APPROVAL WHERE APPROVE_RESULT =0 ) a ON a.APPLICATION_TIME = b.APPLICATION_TIME

Test

SELECT
	a.NUM AA_NO,
CASE WHEN b.NUM IS NULL THEN '0' ELSE b.NUM END AS BB_NO 
FROM
	AA a LEFT JOIN BB b ON a.NUM = b.NUM

成功的與失敗的left join，如果右表返回爲null，則 默認值爲0

SELECT
	res.YID 
FROM
	( SELECT y.ID YID,
					CASE WHEN n.ID IS NULL THEN '0' ELSE n.ID 
					END AS NID 
	  FROM
			( SELECT a.ID ID 
			FROM
				( SELECT MAX( ID ) ID,
								 APPLICATION_TIME,
								 COUNT( * ) NUM 
					FROM
						CRD_STA_APPROVAL 
					WHERE
						ORGANIZATION_CODE = 0000 
						AND POSITION_LEVEL <= 2 
						AND APPROVE_RESULT = 3 
					GROUP BY
						APPLICATION_TIME 
				) a 
			WHERE
				a.NUM = 1 
			) y
		LEFT JOIN ( SELECT ID FROM CRD_STA_APPROVAL b INNER JOIN ( SELECT APPLICATION_TIME FROM CRD_STA_APPROVAL WHERE APPROVE_RESULT = 0 ) a ON a.APPLICATION_TIME = b.APPLICATION_TIME ) n ON y.ID = n.ID 
	) res 
	WHERE
		res.YID != res.NID

RESULT

SELECT
	res.YID 
FROM
	( SELECT y.ID YID,
					CASE WHEN n.ID IS NULL THEN '0' ELSE n.ID 
					END AS NID 
	  FROM
			( SELECT a.ID ID 
			FROM
				( SELECT MAX( ID ) ID,
								 APPLICATION_TIME,
								 COUNT( * ) NUM 
					FROM
						CRD_STA_APPROVAL 
					WHERE
						ORGANIZATION_CODE = 0000 
						AND POSITION_LEVEL <= 2 
						AND APPROVE_RESULT = 3 
					GROUP BY
						APPLICATION_TIME,
						PRODUCT_CODE,
						APPLICATION_TYPES
				) a 
			WHERE
				a.NUM = 1 
			) y
		LEFT JOIN ( SELECT ID FROM CRD_STA_APPROVAL b INNER JOIN ( SELECT APPLICATION_TIME FROM CRD_STA_APPROVAL WHERE APPROVE_RESULT = 0 ) a ON a.APPLICATION_TIME = b.APPLICATION_TIME ) n ON y.ID = n.ID 
	) res 
	WHERE
		res.YID != res.NID