mysql ERROR 1222 (21000): The used SELECT statements have a different number of columns
mysql ERROR 1222 (21000): The used SELECT statements have a different number of columns 表示當前選取的表中的列的數量不相等； 拓展： UNION ：用於將不一樣表中相同列中查詢的數據展現出來；（不包括重複數據）; UNION ALL：用於將不一樣表中相同列中查詢的數據展現出來；（包括重複數據）;mysql 語句
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