I am using UNION to join multiple tables with the same columns. At the end of the my UNION I am aliasing the whole thing as a tableX. After that I have a WHERE statement and a GROUP statement. Efficiency is of great importance! I want to know if it makes a difference from an effeciency standpoint if I repeat the WHERE and GROUP clause with each table in the union, or if I just have it at the end after the alais.
If you put your where clause and group by in each part of the union, then the # of records returned will be lower in each part of the union. Also, your where and group by can utilize the indexes of the
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