mysql并排合并查询结果

Question

我无法理解的简单问题。我只想并排组合两个没有公共(public)数据的表。

table1    table2   ->   result 
a  b       e  f          a  b  e  f
c  d       g  h          c  d  g  h
           i  j          \n \n i  j

Answer 1

您可以使用 RIGHT JOIN 执行此操作，并使用 ROW_NUMBER 为每个表分配一个 ID。请参阅下面的查询:

 SELECT A.column1,A.column2,B.column1,B.column2 FROM
    (SELECT
         @row_number1:=@row_number1+1 AS RowNumber1,
         column1,
         column2
    FROM Table1, (SELECT @row_number1:=0)AS x ORDER BY column1) AS A
    RIGHT JOIN
    (SELECT
         @row_number2:=@row_number2+1 AS RowNumber2,
         column1,
         column2
    FROM Table2, (SELECT @row_number2:=0)AS y ORDER BY column1) AS B
    ON A.RowNumber1=B.RowNumber2