Sql Query to substring

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Hi,

I need a query to substring from the string

TableName : TestTable

ErrorCode
@TestError1(error)
@TestError2[Info]

From ErrorCode column i need to extract TestErro1 and TestError2 here my CHARINDEX will be either '(' or '['.

I have written below query.

SQL

SELECT SUBSTRING(ErrorCode, CHARINDEX ('@', ErrorCode, 1)+1, CHARINDEX ('(', ErrorCode, 1)-CHARINDEX ('@', ErrorCode, 1)-1) FROM TestTable

Posted 24-May-15 21:18pm

RS.Ratheesh

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Mohibur Rashid 25-May-15 3:35am

What SQL Server are you using?

RS.Ratheesh 25-May-15 3:36am

SQLServer 2014

RossMW 25-May-15 3:39am

I suggest add a where clause to filter just the records with '(' and union all with a seperate query olong the same lines with the [ instead.

This assumes there is only either a ( or [ in the fields.

There may be a better way but unfortunately I do not have SQL handy to test

2 solutions

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_Asif_ · Answer 1 · 2015-05-24T21:48:00

Solution 2

Modified the answer. This can also be acheived via PatIndex. See below working example

SQL

DECLARE @TBL TABLE
(
	DATA VARCHAR(100)
)

INSERT INTO @TBL(DATA)
SELECT '@TestError1(error)'
UNION ALL
SELECT '@TestError2[Info]'
UNION ALL
SELECT '@TestErr[Info]'
UNION ALL
SELECT '@TestErrorABCD1234(Info)'


select *, SUBSTRING(Data, PATINDEX('@%[Aa-Zz]%[(,\[]%', DATA )+1, PATINDEX('%[(,\[]%', DATA )-2)
FROM	@TBL

Posted 24-May-15 21:48pm

_Asif_

Updated 24-May-15 23:48pm

v3

Comments

Thava Rajan 25-May-15 4:33am

it is for management studio not for TSQL

_Asif_ 25-May-15 5:50am

You are right! Because of Limited support of reg Exp in PatIndex i got confisued and assumed this might have improved in 2014 which is not the case unfortunately :)

Thava Rajan 25-May-15 6:32am

this one better than the previous one

OriginalGriff · Answer 2 · 2015-05-24T21:44:00

I wouldn't do this in SQL - it's string handling is basic at best. And it doesn't handle multiple "index of" type operations well.

But:

SQL

SELECT SUBSTRING(ErrorCode,
                 CHARINDEX ('@', ErrorCode, 1)+1,
                 (CHARINDEX ('(', ErrorCode, 1) + CHARINDEX ('[', ErrorCode, 1)) - CHARINDEX ('@', ErrorCode, 1) - 1)
FROM TestTable

Should do it.