username upper case lower case how to fix

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username upper case lower case how to fix

sqlguy80

SSCrazy

Points: 2765
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February 27, 2024 at 6:24 pm

#4385873

there is a field userid, firstname and last name which is allowing such userids Allowing upper case and Lowercase , How to fix it so it does not allow upper case/lower case and considers it duplicate?

userid firstname lastname
aina aina aina
Aina Aina Aelson
Thanks in Advance

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ScottPletcher SSC Guru Points: 101103 More actions · Answer 1

That's somewhat confusing. Do you want to not allow mixed case at all? Or do you just want to prevent a duplicate from being inserted, basically ignoring case in determining dup?

SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".

sqlguy80 SSCrazy Points: 2765 More actions · Answer 2

prevent duplicates, ignoring case would be better

ScottPletcher SSC Guru Points: 101103 More actions · Answer 3

You've got some choices, some more annoying than others:

(1) Use an INSERT trigger to check for dups and cancel if a dup would be created.

(2) Create additional columns that are case sensitive and build a UNIQUE index on those columns.

(3) Change the original columns to case sensitive and then build a UNIQUE index on the columns.

SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".

Johan Bijnens SSC Guru Points: 135369 More actions · Answer 4

What collation are you using for these columns ?

If you are actually using case sensitive collations:

How about using lower(userid) , lower(name) and lower(firstname) with the insert statement

or have a persisted computed column performing the concat using these functions and put a unique index on that one.

-- add this computed column
, [userid_name_firstname]  AS concat(lower(userid), lower(name),lower(firstname)) PERSISTED

...

create unique index x_userid_name_firstname on yourschema.yourtable( userid_name_firstname )

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