You seem to be thinking that my 'off the cuff' remarks about joining two tables in one query was a complete treatise or discourse on SQL (of any 'flavour') joins. IT IS NOT get over it. Chris. Indifference will
It is important to understand that a joinis not a physical entityin other words, it does not exist in the actual database tables. A join is created by MySQL as needed, andit persists for the duration of the query execution. - maintainingreferential integrity 是说 MySQL 只允许合法的数据(fo...