SQL ALTER TABLE — Repeat every five secondsIT technician command center
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Database · SQL and Database Administration

SQL ALTER TABLE — Repeat every five seconds

Repeat the command every five seconds for monitoring. Base task: Alter a table definition.

Copy-ready commandSQL ALTER TABLE — Repeat every five seconds
watch -n 5 'ALTER TABLE users ADD COLUMN last_login DATETIME NULL'
Production warning

Continuous or background commands can consume resources. Stop them when troubleshooting is complete.

Requirements and permissions

Requirements
Appropriate database client and connection
Permissions
Database privileges vary
Last reviewed
2026-08-01

Examples

Repeat every five seconds

Repeat the command every five seconds for monitoring.

watch -n 5 'ALTER TABLE users ADD COLUMN last_login DATETIME NULL'

Common errors

Command or option not supported

Confirm the installed platform version supports the base command and the added output or wrapper option.

Access denied or insufficient privileges

Run with the administrative role or delegated permission required by the underlying command.