How do you select a field that contains only uppercase character in mysql or a field that doesn't contain any lower case character?
A:
By using REGEXP : http://www.tech-recipes.com/rx/484/use-regular-expressions-in-mysql-select-statements/
Use [:upper:] for uppercase letters.
SELECT * FROM table WHERE field REGEXP '^[[:upper:]+]$'
Ruel
2010-10-01 05:54:34
using [:upper:] would also select 'Example' .. [^a-z] doesn't seem to work fine
geocine
2010-10-01 05:58:16
edited. Test it. :)
Ruel
2010-10-01 06:06:43
A:
Try this -
select * from <mytable> where upper(<columnname>) = <columnname>
Sachin Shanbhag
2010-10-01 05:56:21
That will not work with a case insensitive collation. In addition, that will also select fields that contain numbers and other characters. I don't think the OP wants that.
Daniel Vassallo
2010-10-01 06:12:02
@Daniel - Yes, I agree this does not handle special characters. But the question is not clear about he wants or does not want to retain special characters.
Sachin Shanbhag
2010-10-01 06:15:01
A:
select * from table1 where (columnname COLLATE latin1_bin )=upper(depart);
kchau
2010-10-01 06:05:02
That will also select fields that contain numbers and other characters. I don't think the OP wants that.
Daniel Vassallo
2010-10-01 06:11:20
+3
A:
You may want to use a case sensitive collation. I believe the default is case insensitive. Example:
CREATE TABLE my_table (
id int,
name varchar(50)
) CHARACTER SET latin1 COLLATE latin1_general_cs;
INSERT INTO my_table VALUES (1, 'SomeThing');
INSERT INTO my_table VALUES (2, 'something');
INSERT INTO my_table VALUES (3, 'SOMETHING');
INSERT INTO my_table VALUES (4, 'SOME4THING');
Then:
SELECT * FROM my_table WHERE name REGEXP '^[A-Z]+$';
+------+-----------+
| id | name |
+------+-----------+
| 3 | SOMETHING |
+------+-----------+
1 row in set (0.00 sec)
If you don't want to use a case sensitive collation for the whole table, you can also use the COLLATE clause as @kchau suggested in the other answer.
Let's try with a table using a case insensitive collation:
CREATE TABLE my_table (
id int,
name varchar(50)
) CHARACTER SET latin1 COLLATE latin1_general_ci;
INSERT INTO my_table VALUES (1, 'SomeThing');
INSERT INTO my_table VALUES (2, 'something');
INSERT INTO my_table VALUES (3, 'SOMETHING');
INSERT INTO my_table VALUES (4, 'SOME4THING');
This won't work very well:
SELECT * FROM my_table WHERE name REGEXP '^[A-Z]+$';
+------+-----------+
| id | name |
+------+-----------+
| 1 | SomeThing |
| 2 | something |
| 3 | SOMETHING |
+------+-----------+
3 rows in set (0.00 sec)
But we can use the COLLATE clause to collate the name field to a case sensitive collation:
SELECT * FROM my_table WHERE (name COLLATE latin1_general_cs) REGEXP '^[A-Z]+$';
+------+-----------+
| id | name |
+------+-----------+
| 3 | SOMETHING |
+------+-----------+
1 row in set (0.00 sec)
Daniel Vassallo
2010-10-01 06:10:13
another way is to use BINARY compare BINARY city_name = BINARY upper(city_name)
geocine
2010-10-04 03:04:41