SQL Cheat Sheet | SQL Cheat Sheet free download

In my previous articles I have given the different SQL queries as well as real life SQL scenarios for interview. In this article I would like to give multiple SQL queries or SQL cheat sheet with examples. I would like to give one SQL Cheat Sheet for free download in PDF format so that you can utilize that SQL Cheat Sheet Easily. This cheat sheet you can easily use in your student journey or professional journey too. You can say that All SQL queries and its syntax on single page.

SQL Cheat Sheet – Fetching Data from Table

Query 1 : Fetch the records from Column1,Column2 from Employee Table.

SELECT Column1,Column2 FROM Employee;

Query 2 : Fetch all the records from Employee table.

SELECT * FROM Employee;

Query 3 : What is Query data and filter rows with a condition

SELECT Column1,Column2 FROM Employee
WHERE condition;

Query 4 : What is Query distinct rows from a table

SELECT DISTINCT Column1 FROM Employee
WHERE condition;

Query 5 : How to Sort the result set in ascending or descending order

SELECT Column1,Column2 FROM Employee
ORDER BY Column1 ASC [DESC];

Query 6 : How to return N rows from Employee table.

SELECT Column1,Column2 FROM Employee
ORDER BY Column1
LIMIT n OFFSET offset;

Query 7 : How to Group rows using an aggregate function?

SELECT Column1, aggregate(Column2)
FROM Employee
GROUP BY Column1;

Query 8 : How do you filter groups using Having Clause.

SELECT Column1, aggregate(Column2) FROM Employee GROUP BY Column1 HAVING condition;  

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SQL Cheat Sheet – Working with Multiple tables

Query 1 : How to Join 2 tables using Inner join table – t1 and table t2

SELECT Column1, Column2  FROM t1 INNER JOIN t2 ON condition;  

Query 2 : How to Join 2 tables using left join – table-t1 and table t2.

SELECT Column1, Column2 
FROM t1
LEFT JOIN t2 ON condition;

Query 3 : How to Join 2 tables using right join – table-t1 and table t2.

SELECT Column1, Column2 
FROM t1
RIGHT JOIN t2 ON condition;

Query 4 : How to Perform full outer join with using t1 and t2 table.

SELECT Column1, Column2 
FROM t1
FULL OUTER JOIN t2 ON condition;

Query 5 : How to produce Cartesian product of 2 tables?

SELECT Column1, Column2 
FROM t1
CROSS JOIN t2;

Way 2 for cartesian or cross join :

SELECT Column1, Column2 
FROM t1, t2;

Query 6 :How to do Self Join of the table t1

SELECT Column1, Column2
FROM t1 A
INNER JOIN t1 B ON condition;

SQL Cheat sheet – SQL Operators

Query 1 : How to Combine two rows from table t1 and table t2.

SELECT Column1,Column2 FROM t1
UNION [ALL]
SELECT Column1,Column2 FROM t2;

Query 2 : How to intersect the data from table t1 and table t2.

SELECT Column1,Column2 FROM t1
INTERSECT
SELECT Column1,Column2 FROM t2;

Query 3 : How to Subtract a result set of table t1 from another result set of table t2.

SELECT Column1,Column2 FROM t1
MINUS
SELECT Column1,Column2 FROM t2;

Query 4 : How to Query rows using pattern matching %, _

SELECT Column1,Column2 FROM t1
WHERE Column1 [NOT] LIKE pattern;

Query 5: How to fetch records from Value list?

SELECT Column1,Column2 FROM t
WHERE Column1 [NOT] IN value_list;

Query 6 : How to fetch all columns between two ranges?

SELECT Column1,Column2 FROM t
WHERE  Column1 BETWEEN Low_range_value AND high_range_value;

Query 7: How to Check if values in a table is NULL or not?

SELECT Column1,Column2 FROM t
WHERE  Column1 IS [NOT] NULL;

SQL Cheat Sheet- Create Table and Manage tables

Query 1 : Create a new table t1 with three columns and having primary key.

CREATE TABLE t (
     id INT PRIMARY KEY,
     name VARCHAR NOT NULL,
     price INT DEFAULT 0
);

Query 2 : How to delete the table from the database?

DROP TABLE t ;

Query 3 : How to add a new column to the table t1?

ALTER TABLE t ADD column;

Query 4 : How to Drop column column1 from the table?

ALTER TABLE t DROP COLUMN column1 ;

Query 5 : How to Add a constraint to the table?

ALTER TABLE t ADD constraint;

Query 6 : How to Drop a constraint from table t1?

ALTER TABLE t DROP constraint;

Query 7 : How to rename a table from t1 to t2?

ALTER TABLE t1 RENAME TO t2;

Query 8 :How to rename column c1 to c2?

ALTER TABLE t1 RENAME c1 TO c2 ;

Query 9 : How to remove data from table t1?

TRUNCATE TABLE t;

SQL Cheat Sheet – With SQL Constraints

Query 1 : How to set two primary keys (Composite key) for one table t1 ?

CREATE TABLE t1(
    column1 INT, column2 INT, column3 VARCHAR,
    PRIMARY KEY (column1,column2)
);

Query 2 : How to Set Foreign Key to table t1?

CREATE TABLE t1(
    column1 INT PRIMARY KEY,  
    column2 INT,
    FOREIGN KEY (column2 ) REFERENCES t2(column2 )
);

Query 3 :How to set unique columns for table t1?

CREATE TABLE t1(
    column1 INT, column2 INT,column3 INT
    UNIQUE(column2 ,column3 )
);

Query 4 : How to add Check constraint which ensure column1 > 0 and values in column1 >= column2?

CREATE TABLE t1(
  column1 INT, column2 INT,
  CHECK(column1 > 0 AND column1 >= column2)
);

Query 5 : How to set Not Null Constraint for table t1?

CREATE TABLE t1(
     column1 INT PRIMARY KEY,
     column2 VARCHAR NOT NULL
);

SQL Cheat sheet – Modifying the Data

Query 1 :How to insert one row into a table t1?

INSERT INTO t(column_list)
VALUES(value_list);
commit;

Query 2 : How to Insert multiple rows in table t1?

INSERT INTO t1(column_list)
VALUES (value_list), 
       (value_list), …;

Query 3 : How to Insert rows from One table (t2) to other table t1?

INSERT INTO t1(column_list)
SELECT column_list
FROM t2;

Query 4 : How to Update new value in the column column1 for all rows?

UPDATE t1
SET column1 = new_value;

Query 5 : How to Update values in the column column1, column2 that match the condition?

UPDATE t
SET column1 = new_value, 
        column2 = new_value
WHERE condition;

Query 6 : How to Delete all data from the table?

DELETE FROM t1;

Query 7 : How to Delete subset of rows in a table?

DELETE FROM t1
WHERE condition;

SQL CheatSheet – Managing views

Query 1 : How to Create a new view that consists  of column1 and column2?

CREATE VIEW v(column1,column2) 
AS
SELECT column1, column2
FROM t1;

Query 2 : How to Create a new view with check constraint?

CREATE VIEW v(column1,column2) 
AS
SELECT column1, column2
FROM t;
WITH [CASCADED | LOCAL] CHECK OPTION;

Query 3 : How to Create a recursive view with multiple tables?

CREATE RECURSIVE VIEW v 
AS
select-statement -- anchor part
UNION [ALL]
select-statement; -- recursive part

Query 4 :How to create temporary view

CREATE TEMPORARY VIEW v 
AS
SELECT column1, column2
FROM t1;

Query 5 : How to Delete a view

DROP VIEW view_name;

SQL CheatSheet – Managing Indexes

Query 1 : How to Create an index on column1 and column2 of the t table?

CREATE INDEX index_name 
ON t1(column1,column2);

Query 2 : How to Create an unique index on column3, column4 of the t table

CREATE UNIQUE INDEX index_name 
ON t(c3,c4);

Query 3 : How to Drop Index?

DROP INDEX index_name ;

SQL Cheat Sheet – Managing triggers

Query 1 : How to create or Modify the Triggers?

CREATE OR MODIFY TRIGGER trigger_name
WHEN EVENT
ON table_name TRIGGER_TYPE
EXECUTE stored_procedure;

WHEN

• BEFORE – invoke before the event occurs
• AFTER – invoke after the event occurs

EVENT

• INSERT – invoke for INSERT
• UPDATE – invoke for UPDATE
• DELETE – invoke for DELETE

TRIGGER_TYPE

• FOR EACH ROW
• FOR EACH STATEMENT

Query 2 : How to Delete a specific trigger?

DROP TRIGGER trigger_name; 

These are some important SQL Cheat sheet with using which team can easily work on SQL queries.