与case和“=”的SQL区分大小写的字符串比较

Question

i have one table named category.

in this table i have two columns 1.) cat_id , 2.) cat_name

in this table i have added record with this value : cat_id = 1 , cat_name = test

Now when i am going to run select query

SELECT * FROM category WHERE cat_name = 'Test'

this query returns me null result because in database record string is test and in query it's a Test mark the differance of capital string here. Instade of null result i want the result with 1st record.

also i want same result in vice versa small and capital string.

i am using sqlite as database.

Answer 1

使用上部功能。

SELECT * FROM category WHERE upper(cat_name) = upper('Test')

Answer 2

SELECT * FROM category WHERE cat_name = 'Test' COLLATE NOCASE;

Answer 3

use LOWER:

SELECT * FROM category WHERE LOWER(cat_name) = 'test'

will get you all combinations of TeSt