#1
 User Input Validation is Crucial  
 Use Prepared Statements Always  
 Escape Special Characters Properly  
 Limit Database Permissions Intelligently  
 Employ Web Application Firewalls  
 Regularly Update and Patch Systems  
 Conduct Regular Security Audits  

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Monitor Database Activity Continuously  
 Educate Developers on Security  
 Test for Vulnerabilities Regularly