How can you avoid DQL Injection?

How can you avoid DQL Injection? Correct Answer using careful programming

SQL injection refers to an injection attack wherein an attacker can execute malicious SQL statements that control a web applications database server – RDBMS. By using careful programming SQL injection can be avoid.
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Related Questions

You are the administrator of contoso.local domain. You organize the domain into organizational units as shown in the EXHIBIT. You configure the local security options and other settings for the default domain policy object You delegate administration of Michigan and Florida OU. You want to prevent those administrators from creating any other group policy objects with settings that conflict with those you configured.What should you do?
You must service the laser printer in your office. Which part of the printer shoud you avoid touching because it is hot?
There is simply no way one can avoid conflict hence. Of you must fight , fight to win
To avoid eyestrain, you should place the monitor --- away from your eye.