SQL SERVER query is case sensitive

       Generally, SQL Server databases are case-insensitive by default when querying data. However, if we have special needs and want to be case-sensitive when querying data, we can use COLLATE to achieve this requirement and test the data:

--Test Data
if not object_id(N'Tempdb..#T1') is null
	drop table #T1
Go
Create table #T1(name VARCHAR(50))
Insert #T1
select N'Abcd' union all
select N'abcd'
GO
-- end of test data

       Case-insensitive writing:

SELECT *
FROM #T1
WHERE name LIKE 'A%' COLLATE Chinese_PRC_CI_AS; -- case insensitive

       result:

       Case-sensitive writing:

SELECT *
FROM #T1
WHERE name LIKE 'A%' COLLATE Chinese_PRC_CS_AS; -- case sensitive

       result:

       We have implemented a case-sensitive query method above, which can be processed according to actual needs in the future.