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The effective way to prevent SQL injection attacks is
perform input validation
use stored procedures
all of these
limit account privileges
All three are countermeasures against SQL injection attacks. Performing input validation is the single most effective countermeasure if for some odd reason the developers chose not to used stored procedures and the systems admins chose not to limit account privileges.
Question is misleading: asks for most effective, answer is all!
Edit: Most is removed from the question
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