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CREATE TABLE ref_table1 (id int(11) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
CREATE TABLE ref_table2 (id int(11) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
CREATE TABLE `main` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ref_id1` int(11) NOT NULL,
`ref_id2` int(11) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `idx_1` (`ref_id1`,`ref_id2`),
KEY `FK_set_out_analysis_route_id` (`ref_id2`),
CONSTRAINT `FK_1` FOREIGN KEY (`ref_id1`) REFERENCES `ref_table1` (`id`) ,
CONSTRAINT `FK_2` FOREIGN KEY (`ref_id2`) REFERENCES `ref_table2` (`id`)
) ENGINE=InnoDB;
SET FOREIGN_KEY_CHECKS=0;
DROP INDEX `idx_1` ON `main`;
SHOW TABLES;
Tables_in_test
main
ref_table1
ref_table2
# restart
ALTER TABLE `main` ADD INDEX `idx_1` (`ref_id1`);
SHOW CREATE TABLE `main`;
Table Create Table
main CREATE TABLE `main` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ref_id1` int(11) NOT NULL,
`ref_id2` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `FK_set_out_analysis_route_id` (`ref_id2`),
KEY `idx_1` (`ref_id1`),
CONSTRAINT `FK_1` FOREIGN KEY (`ref_id1`) REFERENCES `ref_table1` (`id`),
CONSTRAINT `FK_2` FOREIGN KEY (`ref_id2`) REFERENCES `ref_table2` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
DROP TABLE main, ref_table1, ref_table2;
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