Why does this SQL UPDATE lock the entire table?

Why does this SQL UPDATE lock the entire table. The SQL code updates with a condition that has no index. In MySQL it locks every row it scans. In SQL services one update blocks all other writes.

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Why does this SQL UPDATE lock the entire table? #sqlanalytics

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Append Data to Access Database Records: Efficient Solutions
Append Data Access Database efficiently using SQL UPDATE statements. Learn to directly update records, improving speed & data integrity. #SQLUpdate #AccessDatabase #DatabaseManagement #DataEfficiency #DataIntegrity #SQLTips
https://tech-champion.com/database/append-data-to-access-database-records-efficient-solutions/
Learn efficient methods to append data to existing records in an Access database. Avoid workarounds and optimize you...
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https://tech-champion.com/database/db2luw/resolving-postgresql-update-errors-a-troubleshooting-guide/