1Fallbacks
COALESCE can take many arguments. COALESCE(mobile_phone, home_phone, work_phone, 'Unreachable'). The database will check each column from left to right, returning the very first one that actually has data in it.
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The Power of COALESCE in SQL & Databases
Learn about The Power of COALESCE in this comprehensive SQL & Databases development tutorial. Default values.
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Pascual Vila
Frontend Instructor // Code Syllabus
Lesson Glossary
[01]CASE
SQL Conditional block.
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// CASE context[02]COALESCE
Returns first non-null value.
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// COALESCE context