I have a table containing a unique ID field. Another field (REF) contains a reference to another dataset's ID field. 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. I made a 1st version using a temp table but I would like to know - is there is a wa...
<select onChange="javascript:doSomething();"> <option>A</option> <option>B</option> <option>C</option> </select> Now, doSomething() only gets triggered when the selection changes. I want to trigger doSomething() when the user selects any option, possibly the same one again. I have tried using an "onClick" handler, but that gets triggered before the user starts the selection process. So, is ...
Select column is more performatic of select *, but if you is developing an oriented object system, then you will like use object.properties and you can need a properties in any part of apps, then you will need write more methods to get properties in special situations if you don't use select * and populate all properties.
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.
Just for kicks and giggles, I put the SELECT .* 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.*, [column list from table b] with a proper JOIN.
Is it possible to do a select statement that takes only NOT NULL values? Right now I am using this: SELECT * FROM table And then I have to filter out the null values with a php loop. Is there a ...
