sql 语句,例如我有两张表,t1表有字段a b ct2表有字段a d esql 语句,例如我有两张表,t1表有字段a a字段存数据12t2表有字段a a字段存数据34我现在写一个selectselect a from t1union allselect b from t2显示结果为a1234请问一下大神如果我想显示结果为a12a34要怎么写才好?
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