MySQL stored procedure vs function, which would I use when?

The most general difference between procedures and functions is that they are invoked differently and for different purposes: A procedure does not return a value. Instead, it is invoked with a CALL statement to perform an operation such as modifying a table or processing retrieved records. A function is invoked within an expression and returns … Read more

How to filter Pandas dataframe using ‘in’ and ‘not in’ like in SQL

You can use pd.Series.isin. For “IN” use: something.isin(somewhere) Or for “NOT IN”: ~something.isin(somewhere) As a worked example: import pandas as pd >>> df country 0 US 1 UK 2 Germany 3 China >>> countries_to_keep [‘UK’, ‘China’] >>> df.country.isin(countries_to_keep) 0 False 1 True 2 False 3 True Name: country, dtype: bool >>> df[df.country.isin(countries_to_keep)] country 1 UK … Read more

Function vs. Stored Procedure in SQL Server

Functions are computed values and cannot perform permanent environmental changes to SQL Server (i.e., no INSERT or UPDATE statements allowed). A function can be used inline in SQL statements if it returns a scalar value or can be joined upon if it returns a result set. A point worth noting from comments, which summarize the … Read more

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