sql,variables,coding-style,condition , SQL Repeated Condition in Two Tables


SQL Repeated Condition in Two Tables

Question:

Tag: sql,variables,coding-style,condition

I am a beginner to SQL, and I am having trouble getting rid of repeated code. I have a condition "AccountId=20" that I use twice in a SQL query. The SQL looks something like:

DELETE FROM Table_A WHERE FunctionId IN (Select FunctionId FROM Table_B WHERE AccountId=20);
DELETE FROM Table_B WHERE AccountId=20;

When I change the condition, I have to change both lines in the code.

I want to clean up the repeated code. I have tried something like:

DECLARE @condition datatypeForConditions = AccountId=20;
DELETE FROM Table_A WHERE FunctionId IN (Select FunctionId FROM Table_B WHERE @condition);
DELETE FROM Table_B WHERE @condition;

SQL does not seem to have a datatype for conditions, so I cannot declare this variable. Can I even set a variable for a condition? How can I avoid having to change the condition in two places?


Answer:

you can achieve it like this

DECLARE @AccountId int;
@AccountID=20;
DELETE FROM Table_A WHERE FunctionId IN (Select FunctionId FROM Table_B WHERE [email protected]);
DELETE FROM Table_B WHERE [email protected];

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