Increment
UPDATE table
SET field = field + 1
WHERE id = $numberDecrement but don’t go below a value
GREATEST allows you to specify that the greater of multiple values should used. So in this example if the value drops below zero, zero will be greater used:
UPDATE table
SET field = GREATEST(0, field - 1)
WHERE id = $numberIncrement but don’t go above a value
LEAST allows you to specify that the lower of multiple values should used. So in this example if the value goes above below 9999, 9999 will be used:
UPDATE table
SET field = LEAST(9999, field - 1)
WHERE id = $number
USEFUL?
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