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Fix SQL queries for null value handling #94

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Fix SQL queries for null value handling #94

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9 changes: 4 additions & 5 deletions SQL Deep Dive/3 Valued Logic Exercises/questions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,8 @@
* Table: customers
* Question: adjust the following query to display the null values as "No Address"
*/
SELECT address2
FROM customers

SELECT coalesce(address2, 'No Address')
FROM customers;
/*
* DB: Store
* Table: customers
Expand All @@ -15,7 +14,7 @@ FROM customers

SELECT *
FROM customers
WHERE COALESCE(address2, null) IS NOT null;
WHERE address2 IS NOT null;

/*
* DB: Store
Expand All @@ -24,4 +23,4 @@ WHERE COALESCE(address2, null) IS NOT null;
*/

SELECT coalesce(lastName, 'Empty'), * from customers
where (age = null);
where (age is null);