php mysql timestamp - a few questions -

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i have products table i've added new field use timestamp. i'm not sure if should bigint field or timestamp field though. what's difference , offer best performance?

i want compare current date timestamp value , if difference greater x days (meaning product no longer available) exclude product query results.

i've never used timestamps before , need kick-start understand usage, thanks.

to store time in mysql down second may choose between

  • timestamp
  • datetime

their relationship discussed here.

but make long story short, timestamp integer , is, if no value provided, automatically set. it's choice if want store time of last insert example. datetime has set explicitely , "optically" string of format 'yyyy-mm-dd hh:mm:ss'. mysql processes both fast, ts isn't faster b/c it's integer.

especially if want operate on time beyond <,>,= i'd recommend datetime. there lot of functions available.


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