The document outlines basic SQL SELECT statements, including how to select all columns or specific ones using arithmetic expressions. It explains concepts such as null values, column aliases, the concatenation operator, and using literal character strings. Additionally, it discusses eliminating duplicate rows with the DISTINCT keyword and using the DESCRIBE command to display table structures.

1. USING BASIC SELECT STATEMENT
Created by:
MD. MAHBUBUL ALAM MASUM

2. WE ARE GOING TO USE
THE HUMAN RESOURCES (HR) SCHEMA

3. SELECT (COLUMN_NAME) FROM (TABLE_NAME);

4. SELECT ALL COLUMN
You can select all column by select* keyword.

5. SELECTING SPECIFIC COLUMNS

6. USING ARITHMETIC EXPRESSIONS

7. USING ARITHMETIC OPERATORS

8. RULES OF PREDEDENCE
• Multiplication and division occur before addition and subtraction.
• Operators of the same priority are evaluated from left to right.
• Parentheses are used to override the default precedence or to clarify the
statement.

9. OPERATOR PRECEDENCE

10. NULL VALUE
# Null is a value that is unavailable, unassigned,
unknown or inapplicable.
# Null is not the same as zero or a blank space.

11. DEFINING A NULL VALUE

12. ARITHMETIC EXPRESSIONS CONTAINING A NULL
VALUE EVALUATE TO NULL.

13. COLUMN ALIAS
# COLUMN ALIAS MEANS RENAME A COLUMN HEADING.
# COLUMN ALIAS IMMIDIATELY FOLLOW THE COLUMN NAME.

14. USING COLUMN ALIASES
You can use optional AS keyword between the column name and
the alias.
Requires double quotation marks if it contains spaces or
special characters, or if it is case-sensitive

15. CONCATENATION OPERATOR
# A concatenation operator Links columns or character strings to other columns
# it Is represented by two vertical bars (||)
# it Creates a resultant column that is a character expression

16. LITERAL CHARACTER STRINGS
• A literal is a character, a number, or a date that is included in the
SELECT statement.
• Date and character literal values must be enclosed within single
quotation marks.
• Each character string is output once for each row returned.

17. USING LITERAL CHARACTER STRINGS

18. ALTERNATIVE QUOTE (Q) OPERATOR
• Specify your own quotation mark delimiter.
• Select any delimiter.
• Increase readability and usability.

19. DUPLICATE ROWS
The default display of queries is all rows, including duplicate rows. Distinct or Unique keyword use to eliminate duplicate rows

20. DISPLAYING THE TABLE STRUCTURE
#DESCRIBE command use to display the structure of a table.

21. THANKS FOR WATCHING…