I want to select one same column from 3 tables and get a rows from this one column.

Here is the code:

mysql_query("SELECT开发者_运维技巧 * from tv,movies WHERE hash='123'");

So now i want the column called hash from the tv and movies to bring result from the hash number.

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I don't have the the same columns number in tv and movies.

Make sure if the hash doesn't exist in tv then go to movies.

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Make it one table with category field in it.

that's the only proper way of designing a database.

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SELECT fieldName1 FROM table1 WHERE hash='123'
 UNION
SELECT fieldName1 FROM table2 WHERE hash='123'
 UNION
SELECT fieldName1 FROM table3 WHERE hash='123';

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You have to select equal number of columns in both tables

SELECT tvcol1 as field1,tvcol2 as field2 from tv WHERE hash='123' 
UNION 
SELECT moviescol1 as field1,moviescol2 as field2  from movies WHERE hash='123'

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Reading between the lines and based on your comments to @Bryan's answer, you want all the columns from the tv table, but if it's not found select all the columns from the movies table. In that case use two different queries:

$result = mysql_query("SELECT * FROM tv WHERE hash = '123'") or die( mysql_error() );

if( mysql_num_rows( $result ) == 0 ) {
    $result = mysql_query("SELECT * FROM movies WHERE hash = '123'") or die( mysql_error() );
}

Now $result has the columns from either tv or movies table, or false if the hash wasn't found in either of them.