Советский и российский математик. Окончил МГУ (1941), ученик <small>Die on dbQ execute <br />Query: <strong>							SELECT * FROM (
							    SELECT `url`, `title` FROM `mathedu-books`.`dude`
								UNION ALL 
								SELECT `url`, `title` FROM `mathedu-opera`.`dude`
							) AS `dude-combined` 
							WHERE `dude-combined`.`url` IN ( 'petrovskiy_i_g' )</strong><br />Error Message: MDB2 Error: unknown error<br />Query Values: [VOID]<br />Params: [VOID]