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mysql data types


ignace

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INTEGER(n)

 

the n in previous code tells the length to integer, 0 <= n <= 255, for example n = 4, am i then only able to create 9999 rows? the mysql.org documentation says it doesn't affect the length at all, meaning that if i write INTEGER(4) i still will be able to create 4 billion rows (unsigned), so what does the n actually do?

 

kind regards,

ignace

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what does the n then precisly do? does it define the bytes used? 2^n?

It specifies "display width"... it's just silly.  Data type specifies maximum size.  And if you're referring to an auto-increment field, you probably want UNSIGNED, too.

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