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94 lines
2.3 KiB
94 lines
2.3 KiB
3 years ago
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### Init
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```sql
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CREATE TABLE `table_col_delete` (
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`id` int NOT NULL AUTO_INCREMENT,
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`title` varchar(45) DEFAULT NULL,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
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CREATE TABLE `table_to_col_add` (
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`id` int NOT NULL AUTO_INCREMENT,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
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CREATE TABLE `table_to_rel_add_child` (
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`id` int NOT NULL AUTO_INCREMENT,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
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CREATE TABLE `table_to_rel_add_parent` (
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`id` int NOT NULL AUTO_INCREMENT,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
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CREATE TABLE `table_to_rel_remove_parent` (
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`id` int NOT NULL AUTO_INCREMENT,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
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CREATE TABLE `table_to_rel_remove_child` (
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`id` int NOT NULL AUTO_INCREMENT,
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`table_to_rel_remove_parent_id` int DEFAULT NULL,
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PRIMARY KEY (`id`),
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KEY `table_to_rel_remove_parent_fk_idx` (`table_to_rel_remove_parent_id`),
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CONSTRAINT `table_to_rel_remove_parent_fk` FOREIGN KEY (`table_to_rel_remove_parent_id`) REFERENCES `table_to_rel_remove_parent` (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
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CREATE TABLE `table_to_remove` (
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`id` int NOT NULL AUTO_INCREMENT,
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`table_to_removecol` varchar(45) NOT NULL,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
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```
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## Col delete
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```sql
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ALTER TABLE `table_col_delete`
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DROP COLUMN `title`;
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```
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## Rel delete
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```sql
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ALTER TABLE `table_to_rel_remove_child`
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DROP FOREIGN KEY `table_to_rel_remove_parent_fk`;
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ALTER TABLE `table_to_rel_remove_child`
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DROP COLUMN `table_to_rel_remove_parent_id`,
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DROP INDEX `table_to_rel_remove_parent_fk_idx` ;
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```
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## table delete
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```sql
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DROP TABLE `table_to_remove`;`
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```
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## column add
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```sql
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ALTER TABLE `table_to_col_add`
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ADD COLUMN `new_col_1` VARCHAR(45) NULL AFTER `new_col`;
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```
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## Add rel
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```sql
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ALTER TABLE `table_to_rel_add_child`
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ADD COLUMN `parent_id` INT NULL AFTER `id`,
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ADD INDEX `_p_fk_idx` (`parent_id` ASC) VISIBLE;
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;
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ALTER TABLE `table_to_rel_add_child`
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ADD CONSTRAINT `_p_fk`
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FOREIGN KEY (`parent_id`)
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REFERENCES `table_to_rel_add_parent` (`id`)
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ON DELETE NO ACTION
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ON UPDATE NO ACTION;
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```
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