This SQL cheatsheet is designed to be your quick reference guide for SQL programming. Whether youโre a beginner learning how to query databases or an experienced developer looking for a handy resource, this cheatsheet covers essential SQL topics.
1. Database Basics
-
CREATE DATABASE db_name;-
USE db_name;2. Tables
- Create Table:
CREATE TABLE table_name (col1 datatype, col2 datatype);- Drop Table:
DROP TABLE table_name;- Alter Table:
ALTER TABLE table_name ADD column_name datatype;3. Insert Data
-
INSERT INTO table_name (col1, col2) VALUES (val1, val2);4. Select Queries
- Basic Select:
SELECT * FROM table_name;- Select Specific Columns:
SELECT col1, col2 FROM table_name;- Select with Condition:
SELECT * FROM table_name WHERE condition;5. Update Data
-
UPDATE table_name SET col1 = value1 WHERE condition;6. Delete Data
-
DELETE FROM table_name WHERE condition;7. Joins
- Inner Join:
SELECT * FROM table1 INNER JOIN table2 ON table1.col = table2.col;- Left Join:
SELECT * FROM table1 LEFT JOIN table2 ON table1.col = table2.col;- Right Join:
SELECT * FROM table1 RIGHT JOIN table2 ON table1.col = table2.col;8. Aggregations
- Count:
SELECT COUNT(*) FROM table_name;- Sum:
SELECT SUM(col) FROM table_name;- Group By:
SELECT col, COUNT(*) FROM table_name GROUP BY col;9. Sorting & Limiting
- Order By:
SELECT * FROM table_name ORDER BY col ASC|DESC;- Limit Results:
SELECT * FROM table_name LIMIT n;10. Indexes
- Create Index:
CREATE INDEX idx_name ON table_name (col);- Drop Index:
DROP INDEX idx_name;11. Subqueries
-
SELECT * FROM table_name WHERE col IN (SELECT col FROM other_table);12. Views
- Create View:
CREATE VIEW view_name AS SELECT * FROM table_name;- Drop View:
DROP VIEW view_name;Here you can find SQL Interview Resources๐
https://t.me/DataSimplifier
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