Extracting a portion of a value out of a database column using SQL server -


i'm trying extract portion of value out of database column using sql server. example below works in simple context varchar field. result is: &kickstart& want.

i want same when retrieving column database. sql not doing. i'm thinking easy not seeing.

declare @filename varchar(20) = '&kickstart&.cfg' declare @startpos integer = 0 declare @filenamenoext varchar(20)  select @filenamenoext = left(@filename,( (charindex('.', @filename,  0)) - 1)) select @filenamenoext

here sql statement can't seem work me:

declare @filenamenoext varchar(20)  select      i.installfiletype                                  installfiletype,     o.oslabel                                          oslabel,     select @filenamenoext = (left(oi.filename,( (charindex('.', oi.filename,  0) ) - 1) )) filenamenoext,     oi.filename                                        filename     dbo.operatingsysteminstallfiles oi      join dbo.installfiletypes on oi.installfiletypeid = i.installfiletypeid     join dbo.operatingsystems o on oi.operatingsystemid = o.operatingsystemid

why need variable @ all? what's wrong with:

select      i.installfiletype                                  installfiletype,     o.oslabel                                          oslabel,     left(oi.filename,( (charindex('.', oi.filename,  0) ) - 1) ) filenamenoext,     oi.filename                                        filename     dbo.operatingsysteminstallfiles oi      join dbo.installfiletypes on oi.installfiletypeid = i.installfiletypeid     join dbo.operatingsystems o on oi.operatingsystemid = o.operatingsystemid

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