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Oracle PL SQL Interview Questions


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Oracle Pl Sql Interview Questions

If you're looking for Oracle PL SQL Interview Questions for Experienced or Freshers, you are at right place. There are lot of opportunities from many reputed companies in the world. According to research Oracle PL SQL has a market share of about 2.2%. So, You still have opportunity to move ahead in your career in Oracle PL SQL Development. Greens Technologys offers Advanced Oracle PL SQL Interview Questions 2018 that helps you in cracking your interview & acquire dream career as Oracle PL SQL Developer.

Oracle PL SQL Training In Greens Technology

PL Sql vs Sql
Comparison SQL PL/SQL
Execution Single command at a time Block of code
Application Source of data to be displayed Application created by data aquired by SQL
Structures include DDL and DML based queries and commands Includes procedures, functions, etc
Recommended while Performing CRUD operations on data Creating applications to display data obtained using sql
Compatibility with each other SQL can be embedded into PL/SQL PL/SQL cant be embedded in SQL

Q. What is SQL and also describe types of SQL statements?

SQL stands for Structured Query Language. SQL is a language used to communicate with the server to access, manipulate and control data.

There are 5 different types of SQL statements.

  1. Data Retrieval: SELECT

  2. Data Manipulation Language (DML): INSERT, UPDATE, DELETE, MERGE

  3. Data Definition Language (DDL): CREATE, ALTER, DROP, RENAME, TRUNCATE.

  4. Transaction Control Statements: COMMIT, ROLLBACK, SAVEPOINT

  5. Data Control Language (DCL): GRANT, REVOKE

Q. What is an alias in SQL statements?

Alias is a user-defined alternative name given to the column or table. By default column alias headings appear in upper case. Enclose the alias in a double quotation marks (“ “) to make it case sensitive. “AS” Keyword before the alias name makes the SELECT clause easier to read.

For ex: Select empname AS name from employee; (Here AS is a keyword and “name” is an alias).

Q. What is a Literal? Give an example where it can be used?

A Literal is a string that can contain a character, a number, or a date that is included in the SELECT list and that is not a column name or a column alias. Date and character literals must be enclosed within single quotation marks (‘ ‘), number literals need not.

For ex: Select last_name||’is a’||job_id As “emp details” from employee; (Here “is a” is a literal).


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Q. What is a difference between SQL and iSQL*Plus?

SQL Vs iSQL*Plus

SQL

iSQL*Plus

Is a Language

Is an Environment

Character and date columns heading are left-justified and number column headings are right-justified.

Default heading justification is in Centre.

Cannot be Abbreviated (short forms)

Can be Abbreviated

Does not have a continuation character

Has a dash (-) as a continuation character if the command is longer than one line

Use Functions to perform some formatting

Use commands to format data


Q. Define the order of Precedence used in executing SQL statements.

Order of Precedence used in executing SQL statements

Order Evaluated

Operator

1

Arithmetic operators (*, /, +, -)

2

Concatenation operators (||)

3

Comparison conditions

4

Is[NOT] NULL, LIKE, [NOT] IN

5

[NOT] BETWEEN

6

NOT Logical condition

7

AND logical condition

8

OR logical condition


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