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sql server insert query

Ive created a query but have a syntax error with the underscores.

I wonder if someone could assist, I dont think I am far out.

use dictionary


insert into dbo.TblCurrentWordCounts (WordStat_ID,  Word, NoOfWords, WordLength, WordPosition, ClientCode, MyDateTimeCol,ClientCodeWordPosition, ClientCodeWordWordCountWordLenPosition)

select Word + CONVERT(CHAR(17),GETDATE(),120) AS CurrentDateTime, GETDATE() AS MyDateTimeColWord, Word, NoOfWords, wordlen, WordPosition, ClientCode, ClientCode & '_'& word &'_'& WordPosition,  ClientCode & '_ '& word &'_ '& NoOfWords &'_ '& WordLen &'_ '& WordPosition
from TblWords
where word <>'' and clientcode='210904C'
--where word <>''
group by word, NoOfWords, ClientCode, wordlen, WordPosition
order by clientcode

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PeterBaileyUk
Asked:
PeterBaileyUk
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1 Solution
 
Scott PletcherSenior DBACommented:
String concatenation in SQL Server uses "+" not "&".  & is only for bit-related operations.  For example:

...ClientCode + '_'+ word +'_'+ WordPosition,...
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PeterBaileyUkAuthor Commented:
i tried that first and it failed with
Msg 245, Level 16, State 1, Line 4
Conversion failed when converting the varchar value '_ ' to data type int.

use dictionary


insert into dbo.TblCurrentWordCounts (WordStat_ID,  Word, NoOfWords, WordLength, WordPosition, ClientCode, MyDateTimeCol,ClientCodeWordPosition, ClientCodeWordWordCountWordLenPosition)

select Word + CONVERT(CHAR(17),GETDATE(),120) AS CurrentDateTime, GETDATE() AS MyDateTimeColWord, Word, NoOfWords, wordlen, WordPosition, ClientCode, ClientCode + '_'+ word +'_'+ WordPosition,  ClientCode + '_ '+ word +'_ '+ NoOfWords +'_ '+ WordLen +'_ '+ WordPosition
from TblWords
where word <>'' and clientcode='210904C'
--where word <>''
group by word, NoOfWords, ClientCode, wordlen, WordPosition
order by clientcode

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Scott PletcherSenior DBACommented:
You must CAST any non-char values to char in order to concatenate a char string.  For example:

...CAST(ClientCode AS varchar(10)) + '_'+ word +'_'+ CAST(WordPosition AS varchar(10)),...

Otherwise, SQL tries to convert the strings to numbers in order to add them.

That's logical given the use of the over-loaded "+" operator for both addition and concatenation.  SQL must have rules to provide consistent results.

For example, what is the result of:
SELECT '1' + 4
Is it 5 or '14'?  It's 5, because by default any numeric value forces all values to be converted to numeric.  Note that:
SELECT '1' + '4'
does indeed result in '14'.  Based on SQL's conversion rules, this:
SELECT 1 + 'D'
fails, because "D" can't be converted to a numeric value.
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