sql server - T-SQL stored procedure - select just a few columns -


i have stored procedure selects columns table. need select few of them.

how assign variable select few columns table?

existing stored procedure code:

declare @databasename nvarchar(255) = n’adventureworksdw’ declare @schemaname nvarchar(255) = n’dbo’ declare @tablename nvarchar(255) = n’dimproduct’  begin set nocount on  -- declare parameters internal query declare @sqlstring nvarchar(max) = n” declare @paramdefinition nvarchar(max) = n” declare @columnlist table ( columnid int identity(1,1) , columnname nvarchar(255) , columnmaxlength int , columnminlength int )  declare @columnmaxlength int declare @columnminlength int declare @columncount int = 0 declare @loopcounter int = 1 declare @columnname nvarchar(255)  set @sqlstring = n’select column_name ‘ @databasename + n’.’ + n’information_schema.columns data_type in (”char”, ”nchar”, ”varchar”, ”nvarchar”) , table_schema = @schemaname , table_name = @tablename’  set @paramdefinition = n’@schemaname nvarchar(255), @tablename nvarchar(255)’  insert @columnlist (columnname)  execute sp_executesql @sqlstring, @paramdefinition, @schemaname, @tablename select @columncount = count(*) @columnlist  while (@loopcounter <= @columncount)  begin  select @columnname = columnname @columnlist columnid = @loopcounter  set @sqlstring = n’select ‘ ‘@columnminlength = min(len(‘ + @columnname + ‘))’ ‘, @columnmaxlength = max(len(‘ + @columnname + ‘))’ ‘ ‘ @databasename + n’.’ + @schemaname + n’.’ + @tablename ‘ (nolock) ‘  set @paramdefinition = n’@columnminlength int output, @columnmaxlength int output’  execute sp_executesql @sqlstring, @paramdefinition, @columnminlength output, @columnmaxlength output  update @columnlist  set columnminlength = @columnminlength , columnmaxlength = @columnmaxlength columnid = @loopcounter  set @loopcounter += 1  end  select columnname [column name] , columnminlength [column minimum length] , columnmaxlength [column maximum length] @columnlist order [column name]  end

you can build dynamic sql query , execute follows

create procedure select_mytable (     @fieldlist nvarchar(max) ) declare @select nvarchar(max)  set @select = 'select ' + @fieldlist + ' mytable'  exec sp_executesql @select  go  declare @fieldlist nvarchar(max) = 'username,region' exec select_mytable @fieldlist

Comments

Post a Comment

Popular posts from this blog

1111. appearing after print sequence - php -

morning, i have code takes string of shoe sizes, explodes , puts in table. code works , info displayed correctly on page after table there few 1's after table. i'm confused this. so table looks (in columns of 3 on webpage) available in following sizes: 3 4 5 6 9 10 111 here's codes, purpose of example $x = 3|4|6|10|9 function get_sizes_pipe($x) { $counter = 0; $splits = explode("|",$x); asort($splits); $x = print "<table class='greentable'>"; $x .= print "<thead><tr><th scope='col' colspan='3' abbr='starter'>available in following sizes:</th></tr></thead><tbody><tr>"; foreach ($splits $split) { $entry = print "<td>".$split."</td>"; if($counter == 2){ $entry .= print "</tr><tr>"; $counter =0; } else { $counter++; ...
Read more

java - WARN : org.springframework.web.servlet.PageNotFound - No mapping found for HTTP request with URI [/board/] in DispatcherServlet with name 'appServlet' -

this question has answer here: why spring mvc respond 404 , report “no mapping found http request uri […] in dispatcherservlet”? 3 answers i trying making simple bbs i'm encountering following error, warn : org.springframework.web.servlet.pagenotfound - no mapping found http request uri [/board/] in dispatcherservlet name 'appservlet' i have tried solve error many times, have failed. how can solve error? here web.xml, controllerand , servlet-context. my web.xml <?xml version="1.0" encoding="utf-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-nam...
Read more

Ruby on Rails, ActiveRecord, Postgres, UTF-8 and ASCII-8BIT encodings -

weirdest error, who’s challenge try , me? spent hours yesterday on , it’s magic. can't believe happening , it's driving me crazy. btw, using: rails 4.2.3 ruby 2.2.3 pg 0.18 encoding.default_internal = encoding.default_external = utf-8 config.encoding = 'utf-8' it has postgres, activerecord , encodings! turns out we’ve been getting these errors whenever create new users on database special characters: encoding::undefinedconversionerror: "\xc3" ascii-8bit utf-8 \xc3 may vary depending on characters. weird part we’ve set since beginning utf-8. makes no sense , digged it, , used script: user.all.each |user| user.attributes.each |name, value| if value.is_a? string puts user.email + name.encoding.to_s + value.encoding.to_s end end end and output of 1 of users, users same: dr_lottahelp@blahblah.comutf-8utf-8 dr_lottahelp@blahblah.comutf-8ascii-8bit dr_lottahelp@blahblah.comutf-8ascii-8bit dr_lottahelp@blahblah.comutf-8asci...
Read more