get lowercase data in SQL server - sql-server

Question

I have data like below in one of the column in table.
john;144;ny;
Nelson;154;NY;
john;144;NC;
john;144;kw;
I want to retrieve the rows which has lowercase in 3rd part of the data
so i need to get
john;144;kw;
john;144;ny;
is possible to get the data like this?

Answer 1

Force a case-sensitive matching, and then compare forced-lowercase to original:
SELECT ...
FROM ..
WHERE LOWER(name) = name COLLATE Latin1_General_CS_AS
^^---case sensitive
If the name is all-lower to start with, then LOWER() won't change it, and you'll get a match. If it's something like John, then you'd be doing john = John and the case-sensitivity will fail the match.

Answer 2

This does not really answer your question, it certainly adds nothing to Marc's existing answer in terms of resolving your actual problem, it is merely meant as a demonstration of how simple it is to correct your design (this whole script runs in about a second on my local express instance of SQL Server 2012).
CREATE TABLE dbo.T
(
ThreePartData VARCHAR(60)
);
-- INSERT 20,000 ROWS
INSERT dbo.T (ThreePartData)
SELECT t.ThreePartName
FROM (VALUES ('john;144;ny;'), ('Nelson;154;NY;'), ('john;144;NC;'), ('john;144;kw;')) t (ThreePartName)
CROSS JOIN
( SELECT TOP (5000) Number = 1
FROM sys.all_objects a
CROSS APPLY sys.all_objects b
) n;
GO
-- HERE IS WHERE THE CHANGES START
/**********************************************************************/
-- ADD A COLUMN FOR EACH COMPONENT
ALTER TABLE dbo.T ADD PartOne VARCHAR(20),
PartTwo VARCHAR(20),
PartThree VARCHAR(20);
GO
-- UPDATE THE PARTS WITH THEIR CORRESPONDING COMPONENT
UPDATE dbo.T
SET PartOne = PARSENAME(REPLACE(ThreePartData, ';', '.') + 't', 4),
PartTwo = PARSENAME(REPLACE(ThreePartData, ';', '.') + 't', 3),
PartThree = PARSENAME(REPLACE(ThreePartData, ';', '.') + 't', 2);
GO
-- GET RID OF CURRENT COLUMN
ALTER TABLE dbo.T DROP COLUMN ThreePartData;
GO
-- CREATE A NEW COMPUTED COLUMN THAT REBUILDS THE CONCATENATED STRING
ALTER TABLE dbo.T ADD ThreePartData AS CONCAT(PartOne, ';', PartTwo, ';', PartThree, ';');
GO
-- OR FOR VERSIONS BEFORE 2012
--ALTER TABLE dbo.T ADD ThreePartData AS PartOne + ';' + PartTwo + ';' + PartThree + ';';
Then your query is as simple as:
SELECT *
FROM T
WHERE LOWER(PartThree) = PartThree COLLATE Latin1_General_CS_AS;
And since you have recreated a computed column with the same name, any select statements in use will not be affected, although updates and inserts will need addressing.

Answer 3

Using BINARY_CHECKSUM we can retrieve the rows which has lowercase or upper case
CREATE TABLE #test
(
NAME VARCHAR(50)
)
INSERT INTO #test
VALUES ('john;144;ny;'),
('Nelson;154;NY;'),
('john;144;NC;'),
('john;144;kw;')
SELECT *
FROM #test
WHERE Binary_checksum(NAME) = Binary_checksum(Lower(NAME))
OUTPUT
name
-----------
john;144;ny;
john;144;kw;