yesterday i confronted a problem which is when i merge several variables from several tables of data through using SQL statement the program gave me a message says the capacity of the file is not enough, then i used
then the new table created but it contains over one million rows then i used nodupkey code again then it fixed.
my question here is
why did that happen?
although the all tables contain around 200000 rows ?
this first time happennd with my
please explain the issue because perhaps there is error in my data
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