SQL Server REPLACE AND CHECK IF EXISTS - sql

Question

I have to check the string with the following scenarios in WHERE condition.
The data ProductId stored in the database can be like
7314-3337 sometimes with - symbol and not prefixed with 19
73143337 sometimes without symbol and not prefixed with 19
1973143337 correct format
197314-3337 sometimes with - symbol
I need to filter the record ProductId and the input is correct format , i.e 1973143337
WHERE P.ProductId=#ProductId
How can i filter it if the data stored in other 3 formats?
How to use the string replace(-) and prefix 19 if not exists in SQL server?

Answer 1

please check this 2 approach.
one is very simple and second is some trick. (I think you go with second option which cover everythings)
declare #t table (ProductId varchar(100))
insert into #t
values
('7314-3337')
,('73143337')
,('1973143337')
,('197314-3337')
,('73683337')
,('73143338')
declare #valuetosearch varchar(100) = '1973143337'
--this is very simple , but not work in each schenerio. the second approach is fine.
--select CHARINDEX ( '19','1973143337'), SUBSTRING('1973143337',3,len('1973143337'))
--select * from
--#t
--where
--replace(REPLACE(ProductId ,'-','') ,'19','') = replace(REPLACE(#valuetosearch ,'-','') ,'19','')
select * from
#t
where
REPLACE( case when CHARINDEX ( '19',ProductId) = 1
then SUBSTRING( ProductId ,3,LEN(ProductId))
else ProductId
end ,'-','')
=
REPLACE ( case when CHARINDEX ( '19',#valuetosearch) = 1
then SUBSTRING( #valuetosearch ,3,LEN(#valuetosearch))
else #valuetosearch
end ,'-','')

Answer 2

You should first sanitize your data, if it is not consistent then you won't be able to get the correct results.
For prefixing with 19:
UPDATE foo
SET ProductId = '19' + ProductId
WHERE Left(ProductID, 2) <> '19'
For removing the '-':
UPDATE foo
SET ProductId = REPLACE(ProductId, '-', '')
Then you should be able to get the results you want.
UPDATE:
You could construct a CTE with the results in a single format, and then, filter that CTE:
WITH cte (
FormattedPID
,ProductId
)
AS (
SELECT CASE
WHEN LEFT(ProductId, 2) = '19'
THEN REPLACE(ProductId, '-', '')
ELSE '19' + REPLACE(ProductId, '-', '')
END
,ProductId
FROM foo
)
SELECT FormattedPID
,ProductId
FROM cte
WHERE FormattedPID = #ProductID

Answer 3

You could make sure the column is in the correct format like this:
Remove the - by replacing it with an empty string (197314-3337 -> 1973143337, 7314-3337 -> 73143337).
Add 19 at the beginning (1973143337 -> 191973143337, 73143337 -> 1973143337).
Take 10 rightmost characters of the result and compare to the input (1973143337 -> 1973143337, 1973143337 -> 1973143337).
In Transact-SQL:
WHERE RIGHT('19' + REPLACE(P.ProductId, '-', ''), 10) = #ProductId
Of course, this means no index seek for you, because we are applying functions to the column.
An alternative to that would be to produce the three non-standard formats out of the input:
cut off the initial 19 (1973143337 -> 73143337);
insert the - (1973143337 -> 197314-3337);
insert the - and cut off the 19 (1973143337 -> 197314-3337 -> 7314-3337).
In Transact-SQL:
WHERE P.ProductId IN (
#ProductId,
SUBSTRING(#ProductId, 3, 999999999),
STUFF(#ProductId, 7, 0, '-'),
SUBSTRING(STUFF(#ProductId, 7, 0, '-'), 3, 999999999)
)
This way if there is an index on P.ProductId, it will be used efficiently.
Both approaches assume that the length of the correct format is fixed.