1.For all entries in什么时候使用?2.注意事项?

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1.For all entries in什么时候使用?2.注意事项?

1.For all entries in什么时候使用?2.注意事项?
1.For all entries in什么时候使用?
2.注意事项?

1.For all entries in什么时候使用?2.注意事项?
1.对于不能join的表,使用for all entries in语句将数据库表与内表串联.
for all entries in类似外连接的时候,为避免多次重复数据库查询,用内表的某一字段为条件,从数据库表中取得数据,有一样则选出,相当于过滤数据的作用.
2.① 检查内表是否为空,如果为空,将取得全部数据
② 不能使用LIKE ,BETWEEN 和IN
③要尽可能多的用关键字,否则会把重复的数据删掉

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