如何判断两个表中的行数是否相同

Question

我想知道如何编写SQL语句来判断表A中的行数是否等于表B中的行数？

Answer 1

查询以下内容

SELECT 1
FROM 
   (SELECT COUNT(1) TOTAL_A FROM A) TABLE_A_COUNT,
   (SELECT COUNT(1) TOTAL_B FROM B) TABLE_B_COUNT
WHERE TABLE_A_COUNT.TOTAL_A = TABLE_B_COUNT.TOTAL_B

如果计数匹配，它将返回一行。

Answer 2

if (select count(*) from a) = (select count(*) from b)
begin
    :
end