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i want to subtract 1 from a variable who is stored in my table in mysql
i do it by this query
UPDATE table SET var = var -1
but when i do it
0 - 1 = -1
but mysql do
0 - 1 = 9223372036854775807 when i set in bigint
when i set it to int property then he do
0 -1 = 2147483647
what i do to get
0 - 1 = -1
You need to choose a different (signed) data type that allows storing negative values.
look here for some background :