เพิ่มอัตโนมัติ increment mysql

รหัสตัวอย่าง

3
0

mysql ตั้งค่าหมายเลขอัตโนมัติ increment

ALTER TABLE users AUTO_INCREMENT=1001;
1
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อัตโนมัติ increment คอลัมน์ใน mysql กับการค้นหาผลลัพธ์

SET @auto_increment=0;
SELECT @auto_increment := @auto_increment+1 AS `No`;
1
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แทรกเข้าไปในอัตโนมัติ increment mysql

/* To insert into an auto incrementing field without specifing every column in
the table, you can use the key word default in the place of the auto 
incrementing column*/

INSERT IGNORE INTO my_table VALUES(default, "test1", 222)
/*VS */
INSERT IGNORE INTO my_table(name, num) VALUES("test1", 222)
/*Having to type out all of the column names except the auto incrementing one
can be very tedious when you have many columns, just use the keyword defualt
instead and you only have to type it once.
0
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auto_increment mysql

ALTER TABLE User AUTO_INCREMENT = 1;
-1
0

ยังไงเพื่อเปลี่ยนอัตโนมัติ increment อยู่ที่มีอยู่บนโต๊ะ mysql

ALTER TABLE tbl_access ADD COLUMN `access_id` int(10) NOT NULL PRIMARY KEY AUTO_INCREMENT FIRST
-2
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mysql เพิ่มอัตโนมัติ increment ชื่อที่มีอยู่บนโต๊ะ

ALTER TABLE `users` ADD `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY

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