notes.md

SQL Learning Notes

What is SQL?

SQL (Structured Query Language) is used to communicate with databases.

A database stores information.

A table contains:

• Rows (records)
• Columns (fields)

Example:

Students

Name	Age	CGPA
Mary	22	3.90

Commands learned

SELECT

FROM

WHERE

AND

Symbols

• = all columns

= = greater than or equal to

<= = less than or equal to

= equals

What I learned today

• Selecting all columns
• Selecting specific columns
• Filtering data with WHERE
• Using AND
• Reading SQL syntax