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Re: join 4 tables
Posted by: Peter Brawley
Date: May 19, 2020 12:43PM

Read about Join in SQL primers and in the MySQL manual.

To build a query like that ...

1 Build the From clause ...

from a
join b on a.poiref=b.pdref
join c on a.poictry=c.ctryid
join d on b.pdmp=d.mpid

2 Add Select expressions to the front ...

select a...., b...., c...., d....

3 Add where clause(s) if desired

Edited 1 time(s). Last edit at 05/19/2020 02:15PM by Peter Brawley.

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May 19, 2020 11:34AM
Re: join 4 tables
May 19, 2020 12:43PM

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