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begin section is the execution section of the plsql block which is used for writing the executable statement of the program and different procedural constructs like conditional statements, loops, etc. Its is the mandatory section of the plsql block that start with begin statement block.
Exception section of the plsql block is used for error handeling and defining user defined error mssgs. it is also optional section.
SYNTAX
variablename <data type> (range)
a varchar (20)
DBMS_output.put_line('string');
introduction and impolementation of plsql using block structures and variables
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