Syntax error How to ORDER BY RELEVANCE in MySQL?

How to ORDER BY RELEVANCE in MySQL?

To order by relevance, use the case statement. To understand the concept, let us create a table. The query to create a table is as follows −

mysql> create table OrderByRelevance
   -> (
   -> UserId int,
   -> UserName varchar(200)
   -> );
Query OK, 0 rows affected (0.51 sec)

Now you can insert some records in the table using insert command. The query is as follows −

mysql> insert into OrderByRelevance values(101,'Carol Smith');
Query OK, 1 row affected (0.18 sec)

mysql> insert into OrderByRelevance values(102,'Carol Adams');
Query OK, 1 row affected (0.17 sec)

mysql> insert into OrderByRelevance values(103,'Carolnathan Todd');
Query OK, 1 row affected (0.33 sec)

mysql> insert into OrderByRelevance values(104,'John Smith');
Query OK, 1 row affected (0.22 sec)

mysql> insert into OrderByRelevance values(105,'Sam Carol Bond');
Query OK, 1 row affected (0.12 sec)

Display all records from the table using select statement. The query is as follows −

mysql> select *from OrderByRelevance;

Output

+--------+------------------+
| UserId | UserName         |
+--------+------------------+
| 101    | Carol Smith      |
| 102    | Carol Adams      |
| 103    | Carolnathan Todd |
| 104    | John Smith       |
| 105    | Sam Carol Bond   |
+--------+------------------+
5 rows in set (0.00 sec)

Here is the query to order by relevance. The query is as follows −

mysql> select max(UserId)as Id,UserName from OrderByRelevance
   -> where UserName like '%Carol%' group by UserName
   -> order by case when UserName like 'Carol%' THEN 0
   -> WHEN UserName like '% %Carol% %' THEN 1
   -> WHEN UserName like '%Carol' THEN 2
   -> else 3
   -> end,UserName;

Output

+------+------------------+
|   Id | UserName         |
+------+------------------+
| 102  | Carol Adams      |
| 101  | Carol Smith      |
| 103  | Carolnathan Todd |
| 105  | Sam Carol Bond   |
+------+------------------+
4 rows in set (0.00 sec)
Updated on: 2019-07-30T22:30:24+05:30

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