SQL Basic
By
ukmodak
|
March 31st 2024 10:32:28 AM
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605
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;
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