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How to get the next auto-increment id in MySQL?
MySQL has the AUTO_INCREMENT keyword to perform auto-increment. The starting value for AUTO_INCREMENT is 1, which is the default. It will get increment by 1 for each new record.
To get the next auto increment id in MySQL, we can use the function last_insert_id() from MySQL or auto_increment with SELECT.
Creating a table, with "d" as auto-increment.
mysql> create table NextIdDemo -> ( -> id int auto_increment, -> primary key(id) -> ); Query OK, 0 rows affected (1.31 sec)
Inserting records into the table.
mysql> insert into NextIdDemo values(1); Query OK, 1 row affected (0.22 sec) mysql> insert into NextIdDemo values(2); Query OK, 1 row affected (0.20 sec) mysql> insert into NextIdDemo values(3); Query OK, 1 row affected (0.14 sec)
To display all the records.
mysql> select *from NextIdDemo;
The following is the output.
+----+ | id | +----+ | 1 | | 2 | | 3 | +----+ 3 rows in set (0.04 sec)
We have inserted 3 records above. Therefore, the next id must be 4.
The following is the syntax to know the next id.
SELECT AUTO_INCREMENT FROM information_schema.TABLES WHERE TABLE_SCHEMA = "yourDatabaseName" AND TABLE_NAME = "yourTableName"
The following is the query.
mysql> SELECT AUTO_INCREMENT -> FROM information_schema.TABLES -> WHERE TABLE_SCHEMA = "business" -> AND TABLE_NAME = "NextIdDemo";
Here is the output that displays the next auto-increment.
+----------------+ | AUTO_INCREMENT | +----------------+ | 4 | +----------------+ 1 row in set (0.25 sec)
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