SQL在1表中选择2列WHERE column1 LIKE column2

Question

嗨，大家好我刚接触sql这是我的桌子

我只想选择所有相似的值。

示例输出：

AA AA U
BB BB U
DD DD

Answer 1

SQL小提琴： - http://sqlfiddle.com/#!6/c4564/7

 MobileAds.initialize(getApplicationContext(),getString(R.string.adMob_app_id));

Answer 2

试试这个：

 SELECT charindex.symbol, (SELECT comp FROM charindex AS C2 WHERE LEFT(c2.comp,2) = charindex.symbol) AS Comp2
    FROM charindex
    WHERE ((((SELECT comp FROM charindex AS C2 WHERE LEFT(c2.comp,2) = charindex.symbol))<>""));