检索表格交集的标准SQL查询是什么？

选择联合:

select * from table1 
union 
select * from table1_backup 

选择交叉点的查询是什么？

在SQL Server中交叉

select * from table1 
intersect
select * from table1_backup

SELECT *
FROM table1
WHERE EXISTS
(SELECT *
FROM table1_backup
WHERE table1.pk = table1_backup.pk)

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