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i heard that if I create a table for each variable it could work much faster than creating variables in tables.
is that right? and if yes how effective is that?
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I'm confused by your terminology.
Generally if you need to add a number to a column name then you're doing it wrong. In such cases it is almost always advised to create another table. In database design you need to think ahead. Ask yourself questions like "what if I need to store 100,000 of these things?". Then you'll usually come to the conclusion that "no, I can't add 100,000 columns".
If I table exceeds 20 columns I already feel uncomfortable.
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If you mean like a table for each var, which would men if you have like 50 variables and 50 tables, then no, why would you do something like that ? What are columns made for then ? A table for each system you have, then yes, a table for each variable, no.