How to output the results of several select statements together by SQL

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This can be achieved using CROSS JOIN.

For example, there are two tables, Table1 and Table2, associated with an item of Table3 and Table4, respectively. To output the associated data of Table1 and Table2 to a Select statement at the same time, you can:

SELECT * FROM

(

(SELECT t1.sn FROM Table1 T1 Table3 T3 WHERE t1.sn=t3.sn) t1Info

CROSS JOIN

(SELECT t2.sn FROM Table2 T2 Table4 T4 WHERE t2.sn=t4.sn) t2Info

)

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