join of 2columns from tb1 to another table tb2

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hi frnds

I have 2 tables in mysql i want to select only 2 columns from table1 and want to join on table2 i had tried inner join,left join and all but its not working plz help

> select year,batch from tb1 left join tb2 on tb1;

Posted 23-Nov-13 7:02am

Arun-23

Updated 23-Nov-13 7:13am

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CHill60 · Answer 1 · 2013-11-23T07:18:00

Your on is completely wrong.

You will need a key on one table and a foreign key column on the other that refers back to the first one.

The select then becomes something like

SQL

select year, batch
from tb1
left join tb2 on tb1.key = tb2.foreignkey

There is a tutorial on how to write MySQL queries at tutorialspoint[^]

[Edit]
If you have many columns that you want to match on between the tables then just add those columns to the ON clause. Eg

left join tb2 on tb1.key = tb2.foreignkey and tb1.col2 = tb2.col2 and tb1.col3 = tb2.col3 etc