(參考Mysql )
Create Table 1 2 3 4 5 6 7 8 CREATE TABLE `users` ( `id` int (11 ) NOT NULL AUTO_INCREMENT, `name` varchar (255 ) NOT NULL COMMENT 'user name' , `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP , `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP , PRIMARY KEY (`id`), KEY `index_created_at` (`created_at`) ) ENGINE= InnoDB DEFAULT CHARSET= utf8;
Read Table 1 SHOW CREATE TABLE `users`;
Update Table 1 2 ALTER TABLE `old_table_name`RENAME TO `new_table_name`;
Delete Table 1 DROP TABLE IF EXISTS `users`;
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Create Data 1 2 3 INSERT INTO `users` (`id`, `name`, `created_at`, `updated_at`)VALUES (1 , 'Bear' , NOW(), NOW()),(2 , 'Aries' , NOW(), NOW());
1 2 3 4 INSERT INTO `foods` (`name`, `country`)SELECT 'sushi' , `name`FROM `countries`WHERE `id` = 2 ;
Read Data
Update Data 1 2 UPDATE `users` SET `name`= 'Lin' WHERE `id` = 1 ;
JSON 欄位 (extension_item 不能為 null)
只更新 json 中的特定 key
1 2 UPDATE `foods` SET `extension_item` = json_set(`extension_item`, "$.created_at", '2022-09-27' )WHERE `id` = 1 ;
取代整個 json 欄位的資料
1 2 UPDATE `foods` SET `extension_item` = json_object ("created_at", '2022-09-28' , "updated_at", '2022-09-29' )WHERE `id` = 2 ;
Delete Data 1 2 3 4 5 6 SET SQL_SAFE_UPDATES = 0 ;DELETE FROM `users`WHERE `name` = 'Lin' ;SET SQL_SAFE_UPDATES = 1 ;
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Create Index 1 2 3 4 ALTER TABLE `users`ADD INDEX `index_name` (`name`),ALGORITHM = INPLACE, LOCK = NONE ;
Delete Index 1 2 3 4 ALTER TABLE `users`DROP INDEX `index_name`,ALGORITHM = INPLACE, LOCK = NONE ;
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Create Column 1 ALTER TABLE `users` ADD COLUMN `email` varchar (255 );
Read Column 1 2 DESC `users`;SHOW COLUMNS FROM `users`;
Update Column 1 ALTER TABLE `users` MODIFY COLUMN `email` varchar (63 );
Delete Column 1 ALTER TABLE `users` DROP COLUMN `email`;
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Create Trigger 1 2 3 4 5 6 7 8 CREATE TRIGGER `trigger_insert_posts`AFTER INSERT ON `posts` FOR EACH ROW BEGIN UPDATE `stats` SET `post_count` = 'post_count' + 1 WHERE user_id = new.user_id; END ;
Read Trigger 1 2 3 SHOW TRIGGERS;SHOW CREATE TRIGGER `trigger_name`;
Delete Trigger 1 DROP TRIGGER IF EXISTS `trigger_name`;
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Create Procedure 1 2 3 4 5 CREATE PROCEDURE `procedure_users_name` (IN input_name varchar (255 ), OUT count INT )BEGIN SELECT count (* ) INTO count FROM `users` WHERE `name` = input_name; END ;
Read Procedure 1 2 3 SHOW PROCEDURE STATUS;SHOW CREATE PROCEDURE `procedure_name`;
Delete Procedure 1 DROP PROCEDURE IF EXISTS `procedure_name`;
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Create Variable 1 2 3 SET @name = 'bear' ;SET @id = LAST_INSERT_ID();
Read Variable
Delete Variable
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ʕ •ᴥ•ʔ:記錄一些常見語法,需要時方便查詢。 大寫及``為非必要,僅用來區分語法及關鍵字。