Question

我有以下CASE查询，如果找到任何内容则返回1，否则返回0。我想将这些转换为单个查询，如果其中任何一个为真，则返回1，否则返回0。我该怎样才能完成这个？

SELECT CASE WHEN count(PLACE.CODE) > 0 THEN 1 ELSE 0 END
FROM PLACE
WHERE STYLE = 'RED'
AND RULES = 'NO'



SELECT CASE WHEN count(GARDEN.AREA) > 0 THEN 1 ELSE 0 END
FROM GARDEN
WHERE PLACE = 'GROUND'
AND MAZE = '1'


SELECT CASE WHEN count(place_area.AVAILABLE_AREA) > 0 THEN 1 ELSE 0 END
FROM PLACE_AREA as place_area
INNER JOIN USED_PLACE as used_place
    ON used_place.COLOR = 'RED'
    AND used_place.MAKE = 'INDUSTRY'
WHERE place_area.CODE = 'FLOOR'
AND place_area.DANCE = '0'

Answer 1

如果我理解正确，您可以union all结果并计算sum，如果sum > 0则至少有一个1

Select Case When Sum(x.col) > 0 THEN 1 ELSE 0 END from
(
SELECT CASE WHEN count(PLACE.CODE) > 0 THEN 1 ELSE 0 END as col
FROM PLACE
WHERE STYLE = 'RED'
AND RULES = 'NO'

Union All


SELECT CASE WHEN count(GARDEN.AREA) > 0 THEN 1 ELSE 0 END as col
FROM GARDEN
WHERE PLACE = 'GROUND'
AND MAZE = '1'

Union All

SELECT CASE WHEN count(place_area.AVAILABLE_AREA) > 0 THEN 1 ELSE 0 END as col
FROM PLACE_AREA as place_area
INNER JOIN USED_PLACE as used_place
    ON used_place.COLOR = 'RED'
    AND used_place.MAKE = 'INDUSTRY'
WHERE place_area.CODE = 'FLOOR'
AND place_area.DANCE = '0'
) x

Answer 2

SELECT 
CASE 
    WHEN 
            EXISTS(
                SELECT TOP 1 1
                FROM PLACE
                WHERE STYLE = 'RED'
                AND RULES = 'NO'
                AND count(PLACE.CODE) > 0
            ) 
            OR EXISTS (
                SELECT TOP 1 1 
                FROM GARDEN
                WHERE PLACE = 'GROUND'
                AND MAZE = '1'
                AND count(GARDEN.AREA) > 0
            )
            OR EXISTS (
                SELECT TOP 1 1
                FROM PLACE_AREA as place_area
                INNER JOIN USED_PLACE as used_place
                    ON used_place.COLOR = 'RED'
                    AND used_place.MAKE = 'INDUSTRY'
                WHERE place_area.CODE = 'FLOOR'
                AND place_area.DANCE = '0'
                AND count(place_area.AVAILABLE_AREA) > 0
                ) 
    THEN 1 
    ELSE 0
END

TSQL将这些多个CASE查询转换为一个查询

2 个答案: