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I have two tables with the same columns, and I need to copy one table’s rows to the other table’s rows to create one big table with all the values from both tables. Right now I am doing this query to return the same thing:
SELECT col1, col2, col3 from Table1 union SELECT col1, col2, col3 from Table2 However, it seems horribly inefficient, and on my system is very slow (returns 1210189 records).
May it work to just do: