sql順序分為兩類(lèi):
1.sql的書(shū)寫(xiě)順序
select? from? ? where? ? group by? having? order by [asc/desc]
2.sql的執(zhí)行順序
from? where? group by? having? ? select? order by [asc/desc]
sql順序分為兩類(lèi):
select? from? ? where? ? group by? having? order by [asc/desc]
from? where? group by? having? ? select? order by [asc/desc]