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SQL -Structured Query Language is a domain-specific language used in programming and designed for managing data held in a relational database management system(RDBMS), or for stream processing in a relational data stream management system (RDSMS)

PL/SQL –Procedural Training/Structured Source Language that includes procedural language components like loops and conditions that permit declaration of constants and variables, procedures and functions and might handle runtime errors. One will produce PL/SQL units like procedures, functions, packages, sorts and triggers that are keep within the information for the use by applications that are utilized by any of the Oracle Database informatic interfaces