SQL Select 语句（来自 2 个不同的表）

Question

Heyy I'm new to sql and I'd just like to know if there's a way to retrieve select statements with conditions from other tables.

I want to select all name values that have a number that identifies that they have committed a crime. I only want to select a name once.

"SELECT distinct * FROM  Table1 WHERE number LIKE table2.number "

Answer 1

Are you looking for IN ?

SELECT t1.*
FROM Table1 t1
WHERE t1.number IN (SELECT t2.number FROM table2 t2 t2.number);

Under most circumstances, the rows in a table should be unique. So, you don't need SELECT DISTINCT . The DISTINCT can add a considerable amount of overhead to such a query.

Answer 2

You can able to use INNER JOIN like below,

select tbl1.Name from tableOne tbl1
inner join tableTwo tbl2 ON tbl1.commonKey = tbl2.commonKey
where tbl1.columnName = 'any value'