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Feb 17.2010

Hi

I do have in my database the following tables:

inter_main_usa
inter_main_uk

Both tables have the some structure.

But in the first I have data
In the second I do not have any data yet

lets assume I have in the inter_main_usa the respective column called vehicles data call “car” but in the inter_main_uk I do not have anything yet at the same column.

How can make to be listed the country that only have “car” in the vehicles column, making sure that when I do introduce bike in the vehicles column of inter_main_uk it lists both countries.

thanks

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PHP

2 Comments(s) ↴

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@MindzaiFeb 17.2010 — Not sure I follow what you want, but this sounds like you could have a better database structure. Multiple tables with the same schema is always a bad sign. I would suggest having one table, with a foreign key referencing a countries table (containing rows for uk and usa).
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@SrWebDeveloperFeb 17.2010 — Yep.

But if the structure is set, left join can be used to join two tables with connecting records that match plus an extra for each orphan on left:

[CODE]select * from table1 left join table2 on table1.field=table2.field[/CODE]

Or, selecting only orphans from the join (for auditing purposes):

[CODE]select * from table1 left join table2 on table1.field1 = table2.field1 where field2 is NULL;[/CODE]

Left join and is null might help the OP in this instance, depending on their needs. This is general advice and not specific to this request.

-jim
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