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 be the downfall of mankind, but who cares? Time flies like an arrow,...
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...