MsSql “with”用法

CREATE TABLE #PRODUCT(id INT,NAME1 NVARCHAR(10))

CREATE TABLE #DATA_ATTRIBUTE_ABOUT_PRODUCT(id INT,type1 INT)

CREATE TABLE #DATA_ATTRIBUTE(id INT,NAME1 NVARCHAR(10),name2 NVARCHAR(10))

INSERT INTO #PRODUCT VALUES (1,'AAA')

INSERT INTO #PRODUCT VALUES (2,'BBB')

INSERT INTO #DATA_ATTRIBUTE_ABOUT_PRODUCT VALUES (1,1)

INSERT INTO #DATA_ATTRIBUTE_ABOUT_PRODUCT VALUES (1,2)

INSERT INTO #DATA_ATTRIBUTE_ABOUT_PRODUCT VALUES (1,3)

INSERT INTO #DATA_ATTRIBUTE_ABOUT_PRODUCT VALUES (2,2)

INSERT INTO #DATA_ATTRIBUTE_ABOUT_PRODUCT VALUES (2,3)



INSERT INTO #DATA_ATTRIBUTE VALUES (1,'COUNT','500')

INSERT INTO #DATA_ATTRIBUTE VALUES (2,'COLOR','RED')

INSERT INTO #DATA_ATTRIBUTE VALUES (3,'SIZE','100*200');



--SELECT a.ID,a.Name,MAX(CASE WHEN a.Name1='COUNT' then a.Name2 ELSE '' end) AS [COUNT]

--,MAX(CASE WHEN a.Name1='COLOR' then a.Name2 ELSE '' end) AS [COLOR]

--,MAX(CASE WHEN a.Name1='SIZE' then a.Name2 ELSE '' end) AS [SIZE]

--FROM(

--SELECT a.id,a.Name1 AS Name,c.Name1,c.name2

--FROM #PRODUCT a

--LEFT JOIN #DATA_ATTRIBUTE_ABOUT_PRODUCT b ON a.id = b.id

--LEFT JOIN #DATA_ATTRIBUTE c ON b.type1=c.id

--) a

--GROUP BY a.id,a.NAME;



WITH TEMPTable AS 

(

	SELECT a.id,a.Name1 AS Name,c.Name1,c.name2

	FROM #PRODUCT a

	LEFT JOIN #DATA_ATTRIBUTE_ABOUT_PRODUCT b ON a.id = b.id

	LEFT JOIN #DATA_ATTRIBUTE c ON b.type1=c.id

)

SELECT a.ID,a.Name,MAX(CASE WHEN a.Name1='COUNT' then a.Name2 ELSE '' end) AS [COUNT]

,MAX(CASE WHEN a.Name1='COLOR' then a.Name2 ELSE '' end) AS [COLOR]

,MAX(CASE WHEN a.Name1='SIZE' then a.Name2 ELSE '' end) AS [SIZE]

FROM TEMPTable a

GROUP BY a.id,a.NAME





DROP TABLE #PRODUCT

DROP TABLE #DATA_ATTRIBUTE_ABOUT_PRODUCT

DROP TABLE #DATA_ATTRIBUTE