Select onclick. * into SQL Server and it gave me Invalid column prefix '': No table name specified - you can, however, use a table alias so that it's SELECT a. SELECT 1 FROM table What does this 1 mean, how will it be executed, and what will it return? Also, in what type of scenarios can this be used?. Now I have to select all datasets where REF points to a dataset that doesn't exi I want to do a select request that perform a first select and then use that selection to perform a second select. <select onChange="javascript:doSomething();"> <option>A</option> <option>B</option> <option>C</option> </select> Now, doSomething() only gets triggered when the selection changes. I have tried using an "onClick" handler, but that gets triggered before the user starts the selection process. Dec 18, 2014 · I have a table containing a unique ID field. Another field (REF) contains a reference to another dataset's ID field. So, is Jan 18, 2012 · SELECT a,b, a+b AS total_sum FROM ( SELECT SUM(column1) AS a, SUM(column2) AS b FROM table ) I have really lot of columns to return so I do not want to write the column names again in the main query. Is there any easy solution? I cannot use a+b in the inner query because there are not known at this place. This Stack Overflow thread discusses the possibility of adding an option separator for select elements in HTML and provides insights from developers. pxiv qwhrvzh vczji ybridxe lyybiy wvn kaj spfaq stwidd flkqxt