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Oracle PL SQL Tutorial

PL/SQL stands for Procedural Language extension of SQL. PL/SQL is a combination of SQL along with the procedural features of ...
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01_create_table.sql

-- INTEGER / INT → whole numbers, no decimals (e.g. 1, 42, -7) -- Oracle: NUMBER(p) PostgreSQL: INTEGER ← different!
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12_is_null.sql

-- You CANNOT use = or != to check for NULL: -- WHERE Age = NULL → always returns nothing (WRONG) -- WHERE Age != NULL → ...