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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.
13 cze 2018 · I want to write just 1 query that can handle NULL as well as 1. I will be using the same query in a loop. Example if I give NULL then I want my database to return matching column values. If the input is 1 then I should get 0 from the database. Since, I am using "or" in my query so, it returns 0,1,2. What is the alternative to using or? –
22 maj 2024 · Learn how to write Python code to handle conditional logic such as if, if else, nested if, for loop, while loop, and ternary operators.
The SQL CASE Expression. 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.
Example: SELECTa,b,CASEWHENa=1THEN'aaa'WHENb=2THEN'bbb'ELSE'ccc'END. SQL routines can use CASE statements that use a slightly different syntax from the CASE expressions. Specifically note the requirements for terminating each clause with a semicolon ; and the usage of ENDCASE.
The SQL CASE statement evaluates a list of conditions and adds a column with values based on the condition. For example, -- add a new column 'order_volume' in the Orders table -- and flag any order greater than 10000 as 'Large Order' -- and smaller than 10000 as 'Small Order' SELECT *, CASE WHEN amount >= 10000 THEN 'Large Order' WHEN amount < ...
27 mar 2024 · PySpark When Otherwise – when () is a SQL function that returns a Column type and otherwise () is a function of Column, if otherwise () is not used, it returns a None/NULL value. PySpark SQL Case When – This is similar to SQL expression, Usage: CASE WHEN cond1 THEN result WHEN cond2 THEN result... ELSE result END.
