Select Your City Find Local Matches Doublelist

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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 st version using a temp table but I would like to know is there is a wa .SELECT FROM table What does this mean, how will it be executed, and what will it return? Also, in what type of scenarios can this be used?. I have an SQL statement that has a CASE from SELECT and I just can’t get it right. Can you guys show me an example of CASE where the cases are the conditions and the results are from the cases. For.