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Dec 18, 2014 · 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. 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. 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. Once there's sufficient detail to answer, vote to reopen the question. Closed 8 years ago. I am new to SQL can someone help me understand why do we use Select .* in sql server ? And why is it different. 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.
Jan 11, 2010 · A select query selecting a select statement Asked 16 years, 1 month ago Modified 16 years, 1 month ago Viewed 291k times Oracle SQL - select within a select (on the same table!) Asked 15 years, 6 months ago Modified 9 years, 5 months ago Viewed 142k times <select onChange="javascript:doSomething();"> <option>A</option> <option>B</option> <option>C</option> </select> Now, doSomething() only gets triggered when the selection changes. I. 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?
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