if you want to delete all rows where a value is for example <= 37.0:
Code:
'DELETE FROM table WHERE x<=37.0'
if your PRIMARY KEY is your entity id, read this entity id than you can do:
Code:
'DELETE FROM table WHERE entity_id=%d'
it all depends from your db structure and your SELECT query
you could also set a PRIMARY KEY id AUTO INCREMENT and set your entity_id as UNIQUE
you see, a lot of possible solutions
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