: This is a built-in Oracle function. In this context, it is being used to force the database to pause or "sleep" for a specific amount of time [2, 4].
It looks like you've shared a snippet of code designed for an attack, specifically a time-based blind injection [1, 2]. Technical Breakdown : This is a built-in Oracle function
: This is likely a placeholder where a legitimate search term or data value would normally go. specifically a time-based blind injection [1
: DUAL is a special one-row table in Oracle used to execute functions that don't need data from a specific table [6]. : This is a built-in Oracle function