SQL and PL/SQL Interview Preparation Guide Download PDF
Explore the Structure Query Language (SQL) and PLSQL Interview Questions and Answers
45 SQL and PL/SQL Questions and Answers:
SQL stands for Structure Query Language. SQL is an English like language consisting of commands to store, retrieve, maintain & regulate access to your database.
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.
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.
Date Functions are ADD_MONTHS, LAST_DAY, NEXT_DAY, MONTHS_BETWEEN & SYSDATE.
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.
TTITLE & BTITLE are commands to control report headings & footers.
COLUMN command define column headings & format data values.
BREAK command clarify reports by suppressing repeated values, skipping lines & allowing for controlled break points.
command control computations on subsets created by the BREAK command.
SET command changes the system variables affecting the report environment.