username upper case lower case how to fix
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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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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".
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prevent duplicates, ignoring case would be better
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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".
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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 )Johan
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