问题描述
在SQLite3中,说我有这个简单的表$ p $ row $ value $ value $ $ b $(int)(float)(浮动)
1 15.3 20.2
2 17.8 30.5
3 15.8 25.3
4 16.1 48.0
我怎样才能选择那些行的值:
15.0> = value1
进一步
如何才能细化添加到第一个标准这也是
20.0> = value2
您的帮助是高度赞赏的
第一个逻辑是不正确的,因为如果value1小于15,它也将小于16.5,但只是改变运算符:
从SimpleTable中选择*其中value1<< ; = 15.0和value1
也许你的意思是:
从SimpleTable中选择*其中value1 > = 15.0和value1
再次(考虑调整后的逻辑):
来自SimpleTable,其中value1> = 15.0且value1 = 20.0且value2
您可能希望添加order by子句,如果你想你的结果排序。
in SQLite3, say i have this simple table
rowid value1 value2
(int) (float) (float)
1 15.3 20.2
2 17.8 30.5
3 15.8 25.3
4 16.1 48.0
How could I select those rows where the values are:
15.0 >= value1 <= 16.5 - effectively selecting rows 1,2 & 3
furtherhow can i refine adding to the first criteria this to ALSO20.0 >= value2 <= 37.0 - selecting then only row 1 & 3?
Your help is highly appreciated
I believe your first logic is not correct, for if value1 is less than 15, it will also be less than 16.5, but just change the operators:
Select * from SimpleTable where value1 <= 15.0 and value1 <= 16.5;
Maybe you meant:
Select * from SimpleTable where value1 >= 15.0 and value1 <= 16.5;
Again (considering the adjusted logic):
Select * from SimpleTable where value1 >= 15.0 and value1 <= 16.5 and value2 >= 20.0 and value2 <= 37.0;
You might want to add and "order by" clause if you want your results sorted.
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