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MySQL Row Number
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#MySQL 5.7.12 #please drop objects you've created at the end of the script #or check for their existance before creating #'\\' is a delimiter DROP TABLE `tabla_1`; \\ CREATE TABLE `tabla_1` ( `id` mediumint(8) UNSIGNED NOT NULL, `dato` tinytext COLLATE latin1_spanish_ci NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_spanish_ci; \\ ALTER TABLE `tabla_1` ADD PRIMARY KEY (`id`); \\ ALTER TABLE `tabla_1` MODIFY `id` mediumint(8) UNSIGNED NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1; \\ INSERT INTO `tabla_1` (`dato`) VALUES ('dato1'),('dato2'),('dato3'),('dato4'),('dato5'),('dato6'),('dato7'),('dato8'),('dato9'),('dato10'),('dato11'),('dato12'); \\ SELECT @row AS row, T.* FROM `tabla_1` AS T JOIN (SELECT @row:= 0) R WHERE (@row:= @row+ 1) HAVING (row % 3) = 0 \\ DROP TABLE IF EXISTS `tabla_1`;
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row
id
dato
1
3
3
dato3
2
6
6
dato6
3
9
9
dato9
4
12
12
dato12