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For this question, use the track table in the PostgreSQL database for this course. Suppose you have written the following query: SELECT name, composer FROM
For this question, use the track table in the PostgreSQL database for this course.
Suppose you have written the following query:
SELECT name, composer FROM track;
The problem with it is that some records have a null value for composer.
How would you modify this query to insert Unknown into the composer column in place of null values?
launch database
A
SELECT name, composer,
COALESCE composer 'Unknown'
AS composer
FROM track;
B
SELECT name,
COALESCE composer 'Unknown'
AS composer
FROM track;
C
SELECT
COALESCE composer 'Unknown'
AS composer
FROM track;
D
SELECT name,
COALESCE composer, 'Unknown'
AS composer
FROM track;
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