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Display records on the basis of key-value pairs in MySQL
For this, use JSON_OBJECTAGG(). Let us first create a table −
mysql> create table DemoTable ( Id int, FirstName varchar(100), Age int ); Query OK, 0 rows affected (0.56 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(10,'John',23); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(20,'Carol',21); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(10,'Sam',24); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(20,'Chris',20); Query OK, 1 row affected (0.13 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+------+-----------+------+ | Id | FirstName | Age | +------+-----------+------+ | 10 | John | 23 | | 20 | Carol | 21 | | 10 | Sam | 24 | | 20 | Chris | 20 | +------+-----------+------+ 4 rows in set (0.00 sec)
Following is the query using MySQL JSON_OBJECT to display records in key-value pair −
mysql> select Id,JSON_OBJECTAGG(FirstName,Age) from DemoTable GROUP BY Id;
This will produce the following output −
+------+-------------------------------+
| Id | JSON_OBJECTAGG(FirstName,Age) |
+------+-------------------------------+
| 10 | {"Sam": 24, "John": 23} |
| 20 | {"Carol": 21, "Chris": 20} |
+------+-------------------------------+
2 rows in set (0.07 sec)
Updated on: 25-Sep-2019
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