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Delete one row and reorder the others with the correct ID in MySQL?
To understand the concept, let us first create a table. The query to create a table is as follows
mysql> create table ReorderSortDemo -> ( -> UserId int -> ); Query OK, 0 rows affected (0.57 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into ReorderSortDemo values(14); Query OK, 1 row affected (0.13 sec) mysql> insert into ReorderSortDemo values(4); Query OK, 1 row affected (0.10 sec) mysql> insert into ReorderSortDemo values(6); Query OK, 1 row affected (0.11 sec) mysql> insert into ReorderSortDemo values(3); Query OK, 1 row affected (0.09 sec) mysql> insert into ReorderSortDemo values(8); Query OK, 1 row affected (0.11 sec) mysql> insert into ReorderSortDemo values(18); Query OK, 1 row affected (0.08 sec) mysql> insert into ReorderSortDemo values(1); Query OK, 1 row affected (0.12 sec) mysql> insert into ReorderSortDemo values(11); Query OK, 1 row affected (0.08 sec) mysql> insert into ReorderSortDemo values(16); Query OK, 1 row affected (0.09 sec)
Display all records from the table using select statement. The query is as follows −
mysql> select *from ReorderSortDemo;
The following is the output
+--------+ | UserId | +--------+ | 14 | | 4 | | 6 | | 3 | | 8 | | 18 | | 1 | | 11 | | 16 | +--------+ 9 rows in set (0.00 sec)
First delete one row from the table then use update command to reorder the others. The query is as follows −
mysql> delete from ReorderSortDemo where UserId=8; Query OK, 1 row affected (0.20 sec)
After deleting, let us check the table records once again. The query is as follows −
mysql> select *from ReorderSortDemo;
The output is as follows
+--------+ | UserId | +--------+ | 14 | | 4 | | 6 | | 3 | | 18 | | 1 | | 11 | | 16 | +--------+ 8 rows in set (0.00 sec)
Here is the query to reorder the other columns
mysql> update ReorderSortDemo -> set UserId=UserId-1 -> where UserId > 8; Query OK, 4 rows affected (0.22 sec) Rows matched: 4 Changed: 4 Warnings: 0
Let us check the table records once again. The query is as follows −
mysql> select *from ReorderSortDemo;
The output is as follows
+--------+ | UserId | +--------+ | 13 | | 4 | | 6 | | 3 | | 17 | | 1 | | 10 | | 15 | +--------+ 8 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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