Intermediate LevelSQL & MySQL
How do you inspect and reseed AUTO_INCREMENT / IDENTITY counters in SQL?
❓ Interview Prompt: Explain AUTO_INCREMENT re-seeding (`ALTER TABLE ... AUTO_INCREMENT = N`), resetting primary key counters after truncating test data.
After performing bulk data deletions or staging data cleanup, the database auto-increment counter remains at its highest historic sequence number:
Reseeding Counter:
To reset or adjust the next generated sequence number in MySQL:
•
'ALTER TABLE table_name AUTO_INCREMENT = 1;' (MySQL automatically sets next ID to 'MAX(id) + 1').
Code Implementation Example
sql
-- Reseeding MySQL table AUTO_INCREMENT sequence counter
ALTER TABLE test_users AUTO_INCREMENT = 1;💡Reseeding AUTO_INCREMENT sequence counter after data cleanup.
🎯 Interview Key Takeaway
Use ALTER TABLE table AUTO_INCREMENT = N to reseed primary key sequence counters after data purges.
#MySQL#AUTO_INCREMENT#Reseed#Primary Key#Intermediate
Back to all SQL & MySQL Questions→