How to fix all caps to normal case - sql

Question

I have a sql table that contains an employee's full name in all caps (i.e. SMITH-EASTMAN,JIM M).
I need to be able to separate the full name into two separate columns (Last Name and First Name). This part is going well. Now I could use some assistance with removing the capital letters and putting it in normal case.
How can I take the results of my common table expression and pass them into a function?
WITH CTE AS
(
SELECT FullName = [Employee Name],
LastName = SUBSTRING([Employee Name], 1, CHARINDEX(',',[Employee Name])-1),
FirstNameStartPos = CHARINDEX(',',[Employee Name]) + 1,
MidlleInitialOrFirstNameStartPos = CHARINDEX(' ',[Employee Name]),
MiddleInitialOrSecondFirstName = SUBSTRING([Employee Name], CHARINDEX(' ',[Employee Name]),LEN([Employee Name])),
MiddleInitialOrSecondFirstNameLen = LEN(SUBSTRING([Employee Name], CHARINDEX(' ',[Employee Name]),LEN([Employee Name]))) - 1
FROM ['Med-PS PCN Mapping$']
WHERE [PS Employee ID] IS NOT NULL
),
CTE2 AS
(
SELECT FullName = CTE.FullName,
DerivedFirstName = CASE
WHEN CTE.MiddleInitialOrSecondFirstNameLen = 1
THEN SUBSTRING(CTE.FullName, CTE.FirstNameStartPos, CTE.MidlleInitialOrFirstNameStartPos - CTE.FirstNameStartPos)
ELSE SUBSTRING(CTE.FullName, CTE.FirstNameStartPos, CTE.FirstNameStartPos + CTE.MiddleInitialOrSecondFirstNameLen)
END,
DerivedLastName = CTE.LastName
FROM CTE
)
SELECT *
FROM CTE2
RESULTS
FullName DerivedFirstName DerivedLastName
SMITH-EASTMAN,JIM M JIM SMITH-EASTMAN
O'DAY,MARTIN C MARTIN O'DAY
TROUT,MADISON MARIE MADISON MARI TROUT
CREATE FUNCTION [dbo].[FixCap] ( #InputString varchar(4000) )
RETURNS VARCHAR(4000)
AS
BEGIN
DECLARE #Index INT
DECLARE #Char CHAR(1)
DECLARE #PrevChar CHAR(1)
DECLARE #OutputString VARCHAR(255)
SET #OutputString = LOWER(#InputString)
SET #Index = 1
WHILE #Index <= LEN(#InputString)
BEGIN
SET #Char = SUBSTRING(#InputString, #Index, 1)
SET #PrevChar = CASE WHEN #Index = 1 THEN ' '
ELSE SUBSTRING(#InputString, #Index - 1, 1)
END
IF #PrevChar IN (' ', ';', ':', '!', '?', ',', '.', '_', '-', '/', '&', '''', '(')
BEGIN
IF #PrevChar != '''' OR UPPER(#Char) != 'S'
SET #OutputString = STUFF(#OutputString, #Index, 1, UPPER(#Char))
END
SET #Index = #Index + 1
END
RETURN #OutputString
END
GO
select [dbo].[FixCap] (pass in DerivedFirstName from CTE2);
select [dbo].[FixCap] (pass in DerivedLastName from CTE2);

Answer 1

Do you want something like INITCAP ?
CREATE FUNCTION dbo.F_INITCAP (#PHRASE NVARCHAR(max))
RETURNS NVARCHAR(max)
WITH RETURNS NULL ON NULL INPUT
AS
BEGIN
IF LEN(#PHRASE) < 1 RETURN #PHRASE;
DECLARE #I INT = 1, #C CHAR(1), #P BIT = 0, #OUT VARCHAR(max) = '';
WHILE #I <= LEN(#PHRASE)
BEGIN
SET #C = SUBSTRING(#PHRASE, #I, 1);
IF #C BETWEEN 'A' AND 'Z' COLLATE Latin1_General_CI_AI
BEGIN
IF #P = 0
SET #OUT = #OUT + UPPER(#C);
ELSE
SET #OUT = #OUT + LOWER(#C);
SET #P = 1
END
ELSE
BEGIN
SET #P = 0;
SET #OUT = #OUT + LOWER(#C);
END
SET #I = #I + 1;
END
RETURN #OUT;
END
GO