SQL Basic

By ukmodak | June 6th 2022 12:23:03 PM | viewed 45 times
Description Query
SQL WHERE Clause Syntax

SELECT column_list FROM table_name WHERE condition;

SELECT * FROM table_name WHERE condition;

SQL WHERE Clause Filter Records with WHERE Clause

SELECT * FROM employees WHERE salary > 7000;

SQL AND & OR Operators The AND Operator

SELECT * FROM employees WHERE salary > 7000 AND dept_id = 5;

SQL AND & OR Operators The OR Operator

SELECT * FROM employees WHERE salary > 7000 OR dept_id = 5;

SELECT * FROM employees WHERE salary > 5000 AND (dept_id = 1 OR dept_id = 5);

SQL IN & BETWEEN Operators The IN Operator

SELECT * FROM employees WHERE dept_id IN (1, 3);

SELECT * FROM employees WHERE dept_id NOT IN (1, 3);

SQL IN & BETWEEN Operators The BETWEEN Operator

SELECT * FROM employees WHERE salary BETWEEN 7000 AND 9000;

SELECT * FROM employees WHERE hire_date BETWEEN CAST('2006-01-01' AS DATE) AND CAST('2016-12-31' AS DATE);

SELECT * FROM employees WHERE emp_name BETWEEN 'O' AND 'Z';

SQL ORDER BY Clause ORDER BY

SELECT * FROM employees ORDER BY emp_name;

SELECT * FROM trainees ORDER BY first_name, last_name;

SQL TOP / MySQL LIMIT Clause SQL TOP Syntax

SELECT TOP 3 * FROM employees ORDER BY salary DESC;

SELECT TOP 30 PERCENT * FROM employees ORDER BY salary DESC;

SQL TOP / MySQL LIMIT Clause SQL LIMIT Syntax

SELECT * FROM employees ORDER BY salary DESC LIMIT 3;

SELECT * FROM employees ORDER BY salary DESC LIMIT 2, 1;

SQL DISTINCT Clause SQL LIMIT Syntax

SELECT DISTINCT column_list FROM table_name;

SELECT DISTINCT city FROM customers;

SQL TRUNCATE TABLE Statement TRUNCATE TABLE statement drop and re-create the table in such a way that any auto-increment value is reset to its start value which is generally 1.

TRUNCATE TABLE employees;

bONEandALL
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