Execute each SQL separately and merge and sort the result sets within your program! Sometimes, an external sort may be faster. Those two UNION parts have TableC in common, so we can join the rest to it. I have put together an oracle query that is based on quite a few unions- it executes and the returned data appears to be correct. However, it is incredibly slow.
Is there a better option than Union All for multiple selects from the same row?
UNION statements can sometimes introduce performance penalties into your query. This post has a look at how to tune your query up! Discussion Text If I have two tables each with names, how would I select all the data from both tables, but I can not us a Union all.
I need an alternative to using a set operator but produce the same as a Union all. Hi I have to simple sets of query Qand Q both of them have the SUM function use they work just fine separately, but we want the result in single query. The union in poor performance. I am trying to get data from one row in a table into three rows in a temp table, so I can update the data based on values in a different, and I am wondering if there is a better approach than doing a UNION operation. Just define the CTE first, before the actual UNION query.