seniorMySQL
Composite Index Prefix Rule
Updated May 4, 2026
Short answer
Requirement to use columns from left to right.
Deep explanation
An index (A, B) works for A but not for B alone.
Unlock with a Pro subscription to view this section.
View pricingReal-world example
No real-world example available yet.
Unlock with a Pro subscription to view this section.
Upgrade to ProCommon mistakes
No common mistakes listed yet.
Unlock with a Pro subscription to view this section.
Upgrade to ProFollow-up questions
No follow-up questions available yet.
Unlock with a Pro subscription to view this section.
Upgrade to Pro