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MySQL case-insensitive DISTINCT?
If you want case-insensitive distinct, you need to use UPPER() or LOWER().
Case 1: Using UPPER().
The syntax is as follows:
SELECT DISTINCT UPPER(yourColumnName) FROM yourTableName;
Case 2: Using LOWER().
The syntax is as follows:
SELECT DISTINCT LOWER(yourColumnName) FROM yourTableName;
To understand the above syntax, let us create a table. The query to create a table is as follows:
mysql> create table CaseInsensitiveDistinctDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> UserEmailId varchar(30), -> UserPassword varchar(10), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.64 sec)
Now you can insert some records in the table using insert command. The query is as follows:
mysql> insert into CaseInsensitiveDistinctDemo(UserEmailId,UserPassword) values('John@gmail.com','john123');
Query OK, 1 row affected (0.15 sec)
mysql> insert into CaseInsensitiveDistinctDemo(UserEmailId,UserPassword) values('john@gmail.com','654321');
Query OK, 1 row affected (0.43 sec)
mysql> insert into CaseInsensitiveDistinctDemo(UserEmailId,UserPassword) values('Mike@gmail.com','999999');
Query OK, 1 row affected (0.14 sec)
mysql> insert into CaseInsensitiveDistinctDemo(UserEmailId,UserPassword) values('mike@gmail.com','334556');
Query OK, 1 row affected (0.16 sec)
mysql> insert into CaseInsensitiveDistinctDemo(UserEmailId,UserPassword) values('Carol@gmail.com','1010101');
Query OK, 1 row affected (0.13 sec)
mysql> insert into CaseInsensitiveDistinctDemo(UserEmailId,UserPassword) values('Larry@gmail.com','12345678');
Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement. The query is as follows:
mysql> select *from CaseInsensitiveDistinctDemo;
The following is the output:
+----+-----------------+--------------+ | Id | UserEmailId | UserPassword | +----+-----------------+--------------+ | 1 | John@gmail.com | john123 | | 2 | john@gmail.com | 654321 | | 3 | Mike@gmail.com | 999999 | | 4 | mike@gmail.com | 334556 | | 5 | Carol@gmail.com | 1010101 | | 6 | Larry@gmail.com | 12345678 | +----+-----------------+--------------+ 6 rows in set (0.00 sec)
Here is the query to select case-insensitive distinct.
Case 1: Using UPPER(). The query is as follows:
mysql> select distinct upper(UserEmailId) from CaseInsensitiveDistinctDemo;
The following is the output:
+--------------------+ | upper(UserEmailId) | +--------------------+ | JOHN@GMAIL.COM | | MIKE@GMAIL.COM | | CAROL@GMAIL.COM | | LARRY@GMAIL.COM | +--------------------+ 4 rows in set (0.06 sec)
Case 2: Using LOWER(). The query is as follows:
mysql> select distinct lower(UserEmailId) from CaseInsensitiveDistinctDemo;
The following is the output:
+--------------------+ | lower(UserEmailId) | +--------------------+ | john@gmail.com | | mike@gmail.com | | carol@gmail.com | | larry@gmail.com | +--------------------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
4K+ Views
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