Moteur de recherche dans plusieurs tables sql

SELECT table1.champ, table2.champ,... FROM table1, table2...

SELECT info FROM table1, table2, etc

SELECT info FROM var_name_table WHERE var_name_table IN (SELECT name_table FROM main);

QStringList listInfo;

QSqlQuery sqlquery( "SELECT name_table FROM main;" );
trySqlQuery( sqlquery, __FILE__, __LINE__ );

while ( sqlquery.next() )
{
	QString query2 = QString( "SELECT info from %1;" ).arg( sqlquery.value( 0 ).toString() );
	QSqlQuery sqlquery2 (query2);
	trySqlQuery( sqlquery2, __FILE__, __LINE__ );
	sqlquery2.next();
	listInfo << sqlquery2.value( 0 ).toString() );
}