TSQL 比较两个集合 [英] TSQL Comparing two Sets

问题描述

当给出两组时

s1 ={ a,b,c,d} s2={b,c,d,a}

s1 ={ a,b,c,d} s2={b,c,d,a}

(即)

TableA

Item
a
b
c
d

TableB

Item
b
c
d
a

如何编写Sql查询以显示tableA和tableB中的元素相等".[不使用SP或UDF]

How to write Sql query to display "Elements in tableA and tableB are equal". [Without using SP or UDF]

输出

Elements in TableA and TableB contains identical sets

推荐答案

使用:

SELECT CASE 
         WHEN   COUNT(*) = (SELECT COUNT(*) FROM a) 
            AND COUNT(*) = (SELECT COUNT(*) FROM b) THEN 'Elements in TableA and TableB contains identical sets'
         ELSE 'TableA and TableB do NOT contain identical sets'
       END
  FROM (SELECT a.col
          FROM a
        INTERSECT
        SELECT b.col
          FROM b) x 

测试:

WITH a AS (
  SELECT 'a' AS col
  UNION ALL
  SELECT 'b'
  UNION ALL
  SELECT 'c'
  UNION ALL
  SELECT 'd'),
     b AS (
  SELECT 'b' AS col
  UNION ALL
  SELECT 'c'
  UNION ALL
  SELECT 'd'
  UNION ALL
  SELECT 'a')
SELECT CASE 
         WHEN   COUNT(*) = (SELECT COUNT(*) FROM a) 
            AND COUNT(*) = (SELECT COUNT(*) FROM b) THEN 'yes'
         ELSE 'no'
       END
  FROM (SELECT a.col
          FROM a
        INTERSECT
        SELECT b.col
          FROM b) x 

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