Question

Table a:

field1 field2
x1     x1

Table b:

field 1
x1

How would I select on table b where field1 = to field 1 of table a?

What if the name of table b is field1 of table a, what is the syntax to perform the join as the selected table being a.field1

This is the actual query I am using:

mysql_query("SELECT * FROM tags WHERE id3='$value' AND flag!='w' AND visibility='t' JOIN tags.albumid WHERE photoid=tags.photoid AND visibility!='d' ORDER BY datetimep DESC LIMIT 200");

Answer 1

Depending on how complex your task is, you can either simply connect rows that have the same value:

Select * from a, b where a.field1 = b.field2

or use joins:

select a.* 
from Tableb b
join Tablea a
on a.field1=b.field1

In the first case you might have to filter again using the Distinct key word if you want to avoid multiple rows containing the same data

As for joins, there are different types. See eggyal’s link.