he two valid lines are:
Line 2: salary$ VARCHAR2 (10) NOT NULL := '9000S';
Line 3: v_num1, v_num2 NUMBER;
Here’s why:
Line 2 is valid because salary$ is a valid identifier, and the VARCHAR2 data type is correctly declared with a length and a NOT NULL constraint.
Line 3 is valid because it correctly declares two variables of the NUMBER data type.
The other lines have issues:
Line 4: The syntax is incorrect. It should be v_job VARCHAR2(20);.
Line 5: avg is a reserved keyword in SQL and cannot be used as an identifier.
Line 6: SIMPLE INTEGER is not a valid data type in PL/SQL.
Line 7: #sno is not a valid identifier because it contains a special character (#).
A: Incorrect because avg is a reserved word.
B: Incorrect because a number must be specified for the data type.
C: Correct.
D: Incorrect because the variable name comes after the data type, which is invalid.
E: Incorrect because two variables cannot be defined on a single line.
F: Correct because # is a valid character for variable names.
A: Incorrect because avg is a reserved word.
B: Incorrect because a number must be specified for the data type.
C: Correct because # is a valid character for variable names.
D: Incorrect because the variable name comes after the data type, which is invalid.
E: Incorrect because two variables cannot be defined on a single line.
F: Correct.
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