我试图创建一条语句以检索column1 = column0 = 0和column3 = 1的column1，并且我还希望它从column3 = 0和column2 = 1的column1中检索。
这是我的选择语句，但不起作用。我不确定第二个WHERE使用什么子句。
string insertSql = @"SELECT Status from User_friend
WHERE (ProfileId1 = @FriendProfileId)
AND (ProfileId =
(SELECT ProfileId
FROM User_Profile
WHERE UserId = @UserId))
OR
WHERE (ProfileId = @FriendProfileId)
AND (ProfileId1 =
(SELECT ProfileId
FROM User_Profile
WHERE UserId = @UserId))";
叫我疯了，但我认为您只是在寻找“ OR”运算符...
string insertSql = @"SELECT Status from User_friend
WHERE ((ProfileId1 = @FriendProfileId)
AND (ProfileId =
(SELECT ProfileId
FROM User_Profile
WHERE UserId = @UserId))) OR
((ProfileId = @FriendProfileId)
AND (ProfileId1 =
(SELECT ProfileId
FROM User_Profile
WHERE UserId = @UserId)))";
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我来说两句