SQL and PL/SQL Interview Preparation Guide
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Explore the Structure Query Language (SQL) and PLSQL Interview Questions and Answers

45 SQL and PL/SQL Questions and Answers:

1 :: What is the SQL?

SQL stands for Structure Query Language. SQL is an English like language consisting of commands to store, retrieve, maintain & regulate access to your database.

2 :: What is SQL*Plus?

SQL*Plus is an application that recognizes & executes SQL commands & specialized SQL*Plus commands that can customize reports, provide help & edit facility & maintain system variables.

3 :: What is NVL?

NVL : Null value function converts a null value to a non-null value for the purpose of evaluating an expression. Numeric Functions accept numeric I/P & return numeric values. They are MOD, SQRT, ROUND, TRUNC & POWER.

4 :: What is Date Functions?


5 :: What is Character Functions?

Character Functions are INITCAP, UPPER, LOWER, SUBSTR & LENGTH. Additional functions are GREATEST & LEAST. Group Functions returns results based upon groups of rows rather than one result per row, use group functions. They are AVG, COUNT, MAX, MIN & SUM.

6 :: What is TTITLE and BTITLE?

TTITLE & BTITLE are commands to control report headings & footers.

7 :: What is COLUMN?

COLUMN command define column headings & format data values.

8 :: What is BREAK?

BREAK command clarify reports by suppressing repeated values, skipping lines & allowing for controlled break points.

9 :: What is COMPUTE?

command control computations on subsets created by the BREAK command.

10 :: What is SET?

SET command changes the system variables affecting the report environment.