Configure Advanced Threat Protection for Azure SQL Database
Advanced Threat Protection for Azure SQL Database detects anomalous activities indicating unusual and potentially harmful attempts to access or exploit databases. Advanced Threat Protection can identify Potential *SQL injection*, Access from unusual location or data center, Access from unfamiliar principal or potentially harmful application, and Brute force SQL credentials.
Set up Advanced Threat Protection in the Azure portal
Step 1: Sign into the Azure portal.
Step 2: Navigate to the configuration page of the server you want to protect. [Here sql12345678 ] In the security settings, select Microsoft Defender for Cloud.
Step 3: On the Microsoft Defender for Cloud configuration page:
Step 3a: If Microsoft Defender for SQL hasn't yet been enabled, select Enable Microsoft Defender for SQL.
Step 3b: Select Configure.

Step 3c: Under ADVANCED THREAT PROTECTION SETTINGS, select Add your contact details to the subscription's email settings in Defender for Cloud.

Step 3d: Provide the list of emails to receive notifications upon detection of anomalous database activities in the Additional email addresses (separated by commas) text box. [Skip] Step 3e: Optionally customize the severity of alerts that will trigger notifications to be sent under Notification types. [Skip] Step 3f: Select Save.

Reference:
https://learn.microsoft.com/en-us/azure/azure-sql/database/threat-detection-configure