Question

Table1: ID,Name,some more columns
Table2: ID
Table3: Name

I want get output from table1, whose IDs are present in Table2.IDs & whose Name are present in Table3.Name.

In other words, select data which is present in ALL the 3 tables.

For ex:

Table1:

1 John
2 Will
3 Michael

Table2:

1

Table3:

Will

The output should be

1 John
2 Will

Answer 1

You need to use JOINs.

Your description and your sample output do not match, so I’ll give you one example for each.

Based on your description, it should be 2 INNER JOINs:

select table1.id, table1.name
from table1
inner join table2 on table2.id = table1.id
inner join table3 on table3.name = table1.name

Based on your output, it should be 2 OUTER JOINS with a WHERE clause specifying that at least one of the 2 joins was satisfied:

select table1.id, table1.name
from table1
left outer join table2 on table2.id = table1.id
left outer join table3 on table3.name = table1.name
where table2.id is not null or table3.name is not null