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5 cze 2012 · CASE WHEN ', ' + dbo.Table.Column +',' LIKE '%, lactulose,%' THEN 'BP Medication' ELSE '' END AS [BP Medication] The leading ', ' and trailing ',' are added so that you can handle the match regardless of where it is in the string (first entry, last entry, or anywhere in between).
This will select cases where a exactly matches the supplied value and will include the null values in the column - if that is what you want. Also, the Python value None is equivalent to a SQL NULL. You can always use the ternary operator to switch '=' for 'IS': Would return "IS" if var is None and "=" otherwise.
5 maj 2024 · The PySpark contains() method checks whether a DataFrame column string contains a string specified as an argument (matches on part of the string). This returns true if the string exists and false if not.
Evaluates and returns true_value if condition is true, otherwise evaluates and returns false_value. SQL routines can use IF statements that use a slightly different syntax from IF expressions. Specifically note the requirement for terminating each clause with a semicolon ; and the usage of ENDIF.
The CASEexpression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSEclause.
16 sty 2024 · In the realm of SQL, the CASE WHEN statement functions much like an if-then-else expression, allowing us to create custom classifications within a query. Other programming languages use similar logic – e.g. Python uses if , elif , and else , and JavaScript uses the switch statement.
6 cze 2024 · The ISNULL function in MS SQL takes two arguments: the first is a value or column name, and the second is the default value if the first argument is null. This query retrieves rows where the code column is either null, an empty string, or contains only spaces.
