✔ 最佳答案
A)select * from table where stock=true
B)select * from table where price>=4000
C)select * from table where screen_size = (select max(screen_size) from table)
其實唔同database會有些出入,就算符合sql92標準都有時唔同,你冇頭冇尾好難答中你功課中的答案。以上係基於sql server,如果你指local table,如DBF之類,可以用 set filter。