...e that stores sales proposals. Suppose further that each proposal only has one sales person assigned and one client. So your proposal table would have two foreign keys, one with the client ID and one with the sales rep ID. However, at the time the record is created, a sales rep is not always assig...

...get corrupted. The basic answer. The SqliteOpenHelper object holds on to one database connection. It appears to offer you a read and write connection, but it really doesn't. Call the read-only, and you'll get the write database connection regardless. So, one helper instance, one db connection. ...

...tempted to handle imports in a more rational way but Guido has rejected it one the account of The only use case seems to be running scripts that happen to be living inside a module's directory, which I've always seen as an antipattern. (here) Though, I use this pattern on a regular basis ...

... The most extensible solution is to have just one "base" table (connected to "likes", tags and comments), and "inherit" all other tables from it. Adding a new kind of entity involves just adding a new "inherited" table - it then automatically plugs into the whole like/ta...

I am new to hibernate and need to use one-to-many and many-to-one relations. It is a bi-directional relationship in my objects, so that I can traverse from either direction. mappedBy is the recommended way to go about it, however, I couldn't understand it. Can someone explain: ...

It it ok to have a table with just one column? I know it isn't technically illegal, but is it considered poor design? 15 A...

...Alternatively you cast it with list(x). import pandas as pd data_dict = {'one': pd.Series([1, 2, 3], index=['a', 'b', 'c']), 'two': pd.Series([1, 2, 3, 4], index=['a', 'b', 'c', 'd'])} df = pd.DataFrame(data_dict) print(f"DataFrame:\n{df}\n") print(f"column types:\n{df.dtypes}") col...

...he assignment must actually return something. As others have already mentioned, you could do this, but it's bad because you'll probably just end up confusing yourself when reading that piece of code the next time: if someBoolValue: num1=20 I'm not a big fan of the num1 = someBoolValue and 20 or ...

... objects you're about to move from as the result of calling std::move()). One could also argue that for fundamental types or types for which copying is fast, such as int, bool, or char, there is no need to pass by reference if the function simply needs to observe the value, and passing by value sho...

...s that the different jump instructions take the same amount of time. This one is a little tricky to answer, but here's what I can give: In the Intel Instruction Set Reference, they are all grouped together under one common instruction, Jcc (Jump if condition is met). The same grouping is made toget...