insert-data.md

Insert Data:

1. INSERT:

Explanation: INSERT is used to insert new rows into a table.

Syntax:

INSERT INTO table_name1(column_name1, column_name2, ...)
VALUES(specific_value1, specific_value2, ...);

Example:

INSERT INTO departments(dept_no, dept_name)
VALUES('d010', 'Software Developement');

Result:

1 row inserted. (Query took 0.0320 seconds.)

2. Insert Multiple Rows:

Explanation: Insert Multiple Rows is used to insert multiple rows into a table in a single INSERT statement.

Syntax:

INSERT INTO table_name1(column_name1, column_name2, ...)
VALUES(specific_value1, specific_value2, ...),(specific_value1, specific_value2, ...);

Example:

INSERT INTO departments(dept_no, dept_name)
VALUES('d010', 'Software Developement'),('d011', 'Software Testing');

Result:

2 rows inserted. (Query took 0.0350 seconds.)

3. INSERT INTO SELECT:

Explanation: INSERT INTO SELECT is used to insert rows into a table by selecting data from another table.

Syntax:

INSERT INTO table_name1(column_name1, column_name2, ...)
SELECT
    column_name1,
    column_name2,
    ...
FROM
    table_name1
GROUP BY
    column_name1
LIMIT number_of_limit;

Example:

INSERT INTO salary_appraisal(emp_no, appraisal)
SELECT
    emp_no,
    COUNT(salary)
FROM
    salaries
GROUP BY
    emp_no
LIMIT 3;

Result:

3 rows inserted. (Query took 0.1550 seconds.)

4. Insert On Duplicate Key Update:

Explanation: Insert On Duplicate Key Update is used to insert new rows into a table, and if a duplicate key is found, update the existing row.

Syntax:

INSERT INTO table_name1(column_name1, column_name2, ...)
VALUES(specific_value1, specific_value2, ...)
ON DUPLICATE KEY
UPDATE
    column_name1 = VALUES(column_name1), 
    column_name2 = VALUES(column_name2);

Example:

INSERT INTO salary_appraisal(emp_no, appraisal)
VALUES('100010', '10')
ON DUPLICATE KEY
UPDATE
    emp_no = VALUES(emp_no), 
	appraisal = VALUES(appraisal);

Result:

1 row inserted. (Query took 0.0660 seconds.)

5. INSERT IGNORE:

Explanation: INSERT IGNORE is used to insert new rows into a table, ignoring any duplicate key errors.

Syntax:

INSERT IGNORE
INTO table_name1(column_name1, column_name2, ...)
VALUES(specific_value1, specific_value2, ...);

Example:

INSERT IGNORE
INTO salary_appraisal(emp_no, appraisal)
VALUES('100010', '10');

Result:

1 row inserted. (Query took 0.0880 seconds.)

6. REPLACE:

Explanation: REPLACE is used to insert new rows into a table, and if a duplicate key is found, delete the existing row and insert the new row.

Syntax:

REPLACE
INTO table_name1(column_name1, column_name2, ...)
VALUES(specific_value1, specific_value2, ...);

Example:

REPLACE
INTO salary_appraisal(emp_no, appraisal, dept_no)
VALUES('10005', '14', 'd003');

Result:

1 row affected. (Query took 0.0410 seconds.)

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