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Easy SQL Operators Tutorial for Beginners

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Sure! Here's an easy-to-follow tutorial on basic SQL operators for beginners: 1. SELECT The 'SELECT' statement is used to fetch data from a database. The data returned is stored in a result table, sometimes called the result set. Example: '''sql SE...

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Easy SQL Operators Tutorial for Beginners

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by richa3412

by richa3412

                                        
                                                  Sure! Here's an easy-to-follow tutorial on basic SQL operators for beginners:
 1. SELECT
The 'SELECT' statement is used to fetch data from a database. The data returned is stored in a result table, sometimes called the result set.
Example:
'''sql
SELECT column1, column2
FROM table_name;
'''
 2. WHERE
The 'WHERE' clause is used to filter records. It is used to extract only those records that fulfill a specified condition.
Example:
'''sql
SELECT column1, column2
FROM table_name
WHERE condition;
'''
 3. AND, OR, NOT
The 'AND', 'OR', and 'NOT' operators are used to filter records based on more than one condition.
Example:
'''sql
SELECT column1, column2
FROM table_name
WHERE condition1 AND condition2;
'''
'''sql
SELECT column1, column2
FROM table_name
WHERE condition1 OR condition2;
'''
'''sql
SELECT column1, column2
FROM table_name
WHERE NOT condition;
'''
 4. ORDER BY
The 'ORDER BY' keyword is used to sort the result set in either ascending or descending order. The default order is ascending.
Example:
'''sql
SELECT column1, column2
FROM table_name
ORDER BY column1 ASC;  -- Ascending order
'''
'''sql
SELECT column1, column2
FROM table_name
ORDER BY column1 DESC;  -- Descending order
'''
 5. INSERT INTO
The 'INSERT INTO' statement is used to insert new records into a table.
Example:
'''sql
INSERT INTO table_name (column1, column2, column3)
VALUES (value1, value2, value3);
'''
 6. UPDATE
The 'UPDATE' statement is used to modify the existing records in a table.
Example:
'''sql
UPDATE table_name
SET column1 = value1, column2 = value2
WHERE condition;
'''
 7. DELETE
The 'DELETE' statement is used to delete existing records from a table.
Example:
'''sql
DELETE FROM table_name
WHERE condition;
'''
 8. LIKE
The 'LIKE' operator is used in a 'WHERE' clause to search for a specified pattern in a column.
Example:
'''sql
SELECT column1, column2
FROM table_name
WHERE column1 LIKE 'pattern%';  -- Starts with "pattern"
'''
'''sql
SELECT column1, column2
FROM table_name
WHERE column1 LIKE '%pattern';  -- Ends with "pattern"
'''
'''sql
SELECT column1, column2
FROM table_name
WHERE column1 LIKE '%pattern%';  -- Contains "pattern"
'''
 9. IN
The 'IN' operator allows you to specify multiple values in a 'WHERE' clause.
Example:
'''sql
SELECT column1, column2
FROM table_name
WHERE column1 IN (value1, value2, value3);
'''
 10. BETWEEN
The 'BETWEEN' operator selects values within a given range. The values can be numbers, text, or dates.
Example:
'''sql
SELECT column1, column2
FROM table_name
WHERE column1 BETWEEN value1 AND value2;
'''
 11. NULL
The 'IS NULL' and 'IS NOT NULL' operators are used to filter records with null (empty) values.
Example:
'''sql
SELECT column1, column2
FROM table_name
WHERE column1 IS NULL;
'''
'''sql
SELECT column1, column2
FROM table_name
WHERE column1 IS NOT NULL;
'''
 Practice
To get comfortable with these SQL operators, practice by writing queries on sample databases like the classic "Employees" or "Products" databases. You can also use online SQL practice tools like SQLFiddle or W3Schools.
Let me know if you need any more details or examples!