where

问题 The following EF statement does not compile as it is expecting 2 additional parameters, an int and a bool. I can't figure out how to supply them or what they are used for. Dim L2 = Db.SecurityLogs.Where(Function(x) x.OrderId = OrderId) The compile error is; Error 27 Overload resolution failed because no accessible 'Where' can be called with these arguments: 'Public Function Where(predicate As String, ParamArray parameters() As System.Data.Objects.ObjectParameter) As System.Data.Objects

问题 I am running this query on SQL Server 2012: select 'weird' where '' = 0 It's returning 'weird' . As far as I understand, '' is quite different from 0 . So please explain why the above happens. Thanks 回答1: So, taking a look at the data types where they stand in the WHERE clause SELECT SQL_VARIANT_PROPERTY(0, 'BaseType'),SQL_VARIANT_PROPERTY('', 'BaseType') They return int, varchar respectively. When comparing two different data types, the data type with the lower precedence will convert to the

问题 So, i have to say, SQL is by far my weakest side as a developer. Perhaps what i'm trying to accomplish is pretty easy. I have something like this (It's not the real model, but in order to make it simple to understand without wasting too much time explaining it, i've come up with an example that mimics exactly the table relations i have to use). On one hand, a table, let's call it, "Users". Columns such as a primary key "UserId", "UserName", and so on. Next, another Table, "Licenses". Relates

问题 I have a SQL Server database table with a varbinary(max) column (i.e. Data VarBinary(max) in a create table command). Is it possible to do a where clause with some kind of pattern matching within the binary data? For example, using the C# .NET SqlCommand object, I found that I can do a query like select * from TableName where Data = 0x4638763849838709 go , where the value is the full data column value. But I want to be able to pattern match just parts of the data, like select * from TableName

问题 I have a SQL Server database table with a varbinary(max) column (i.e. Data VarBinary(max) in a create table command). Is it possible to do a where clause with some kind of pattern matching within the binary data? For example, using the C# .NET SqlCommand object, I found that I can do a query like select * from TableName where Data = 0x4638763849838709 go , where the value is the full data column value. But I want to be able to pattern match just parts of the data, like select * from TableName

问题 I have a dict containing 3 dataframes of identical shape. I would like to create: a 4th dataframe which identifies the largest value from the original 3 at each coordinate - so dic['four'].ix[0,'A'] = MAX( dic['one'].ix[0,'A'], dic['two'].ix[0,'A'], dic['three'].ix[0,'A'] ) a 5th with the second largest value dic = {} for i in ['one','two','three']: dic[i] = pd.DataFrame(np.random.randint(0,100,size=(10,3)), columns=list('ABC')) I cannot figure out how to use .where() to compare the original

问题 Simple question: I need a solution so that I can find, lets say names, between A-F, INCLUDING all names that start with F. If you use BETWEEN or A >= value <= F you find out that it stops at F. So I am posting this for suggestions. NOTE: User will see 2 textboxes that accept a range user can type. The user refines how far to go in F boundary as such: User types in 'Fa' means the result should return: Fauder, Fail, Famber, ... etc I have currently 2 solutions but there's got a be a better way.

问题 I have a table of events containing a date (smalldatetime). I have a table of intervals (int) (days before) for when a reminder should be sent - DATEADD(D, *interval*, GETDATE()) . I'm trying to write an SQL statement to get all the events where a reminder should be sent today (based on GETDATE() from the DATEADD function. This is instead of me first getting all the intervals and running SQL in a loop, passing each interval as a parameter into the DATEADD function. Any ideas how I'd do this?

问题 I have this array a = array([1,5,7]) I apply the where function where(a==8) What is returned in this case is (array([], dtype=int64),) However I would like the code to return the integer "0" whenever the where function returns an empty array. Is that possible? 回答1: def where0(vec): a = where(vec) return a if a[0] else 0 # The return above is equivalent to: # if len(a[0]) == 0: # return 0 # or whatever you like # else: # return a a = array([1,5,7]) print where0(a==8) And consider also the

问题 I have this array a = array([1,5,7]) I apply the where function where(a==8) What is returned in this case is (array([], dtype=int64),) However I would like the code to return the integer "0" whenever the where function returns an empty array. Is that possible? 回答1: def where0(vec): a = where(vec) return a if a[0] else 0 # The return above is equivalent to: # if len(a[0]) == 0: # return 0 # or whatever you like # else: # return a a = array([1,5,7]) print where0(a==8) And consider also the