SQL CASE Statement
If there is no ELSE part and no conditions are true, it returns NULL.
sql server - Test if any columns are NULL - Database Administrators...
WHERE c1 IS NULL OR c2 IS NULL OR c3 IS NULL. A somewhat less efficient approach that avoids this is below though.
sql - Return 0 if field is null in MySQL - Stack Overflow
Attribute X is assumed to be empty if it is an empty String, so after that you can declare as a zero instead of last value. In another case, it would remain its original value. Anyway, just to give another way to do that.
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Oracle / PLSQL: CASE Statement
The Oracle/PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle 9i, you can use the CASE statement within a SQL statement.
switch…case in C (Switch Statement in C) with Examples
Once the case match is found, a block of statements associated with that particular case is executed.
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