MySQL ADDTIME Function: Time Addition Operation

The MySQL ADDTIME function is a date and time function used to add a specified time value to another time or date-time value.

Here's a tutorial on using the MySQL ADDTIME function:

1. Syntax

The syntax for the ADDTIME function is:

ADDTIME(time1, time2)

Where time1 and time2 are the time or date-time values you want to add. The function returns the result as a time or date-time value.

2. Examples

Let's start with some basic examples of the ADDTIME function.

a. Adding two time values

SELECT ADDTIME('10:30:45', '02:15:30');

Result:

12:46:15

b. Adding time value to a date-time value

SELECT ADDTIME('2022-08-15 10:30:00', '01:30:00');

Result:

2022-08-15 12:00:00

c. Adding a negative time value

SELECT ADDTIME('10:30:45', '-01:30:00');

Result:

09:00:45

3. Using ADDTIME function in a table

Let's assume we have the following events table:

+----+---------------------+------------+
| id |      start_time     |  duration  |
+----+---------------------+------------+
|  1 | 2023-05-10 10:30:00 | 02:00:00    |
|  2 | 2023-05-11 15:45:00 | 01:30:00    |
|  3 | 2023-05-12 12:00:00 | 00:45:00    |
|  4 | 2023-05-13 17:30:00 | 01:15:00    |
+----+---------------------+------------+

a. Calculate the end time for each event

SELECT id, start_time, ADDTIME(start_time, duration) AS end_time FROM events;

Result:

+----+---------------------+---------------------+
| id |      start_time     |      end_time       |
+----+---------------------+---------------------+
|  1 | 2023-05-10 10:30:00 | 2023-05-10 12:30:00  |
|  2 | 2023-05-11 15:45:00 | 2023-05-11 17:15:00  |
|  3 | 2023-05-12 12:00:00 | 2023-05-12 12:45:00  |
|  4 | 2023-05-13 17:30:00 | 2023-05-13 18:45:00  |
+----+---------------------+---------------------+

In this tutorial, you learned how to use the MySQL ADDTIME function to add time or date-time values, both for individual values and within table data. This function can be useful when you need to perform calculations with time and date-time values in your database queries.

How to use ADDTIME function in MySQL:
- The ADDTIME function in MySQL is used to add a time interval to a given time or date-time expression.
```
SELECT ADDTIME('09:30:00', '03:15:30') AS result_time;
```

MySQL ADDTIME function examples:

Examples of using ADDTIME function in MySQL:

SELECT ADDTIME('12:30:00', '04:45:15') AS result1, ADDTIME('23:45:30', '01:15:45') AS result2;

Time addition in MySQL using ADDTIME:
- Use ADDTIME for time addition calculations:
```
SELECT ADDTIME(column1, column2) AS total_time FROM table_name;
```
ADDTIME function in MySQL for time intervals:
- ADDTIME can be used with time intervals:
```
SELECT ADDTIME('08:00:00', '1:30:00') AS new_time;
```
Performing time calculations with ADDTIME in MySQL:
- Calculate time differences or additions with ADDTIME:
```
SELECT ADDTIME(column1, '04:30:00') AS new_time FROM table_name;
```
ADDTIME function in MySQL for date and time values:
- ADDTIME can be used with date and time expressions:
```
SELECT ADDTIME('2023-01-15 09:00:00', '03:30:00') AS new_datetime;
```
Use cases for ADDTIME function in MySQL queries:
- Apply ADDTIME in queries where time calculations are required, such as scheduling or time-based events.
```
SELECT * FROM appointments WHERE ADDTIME(start_time, '01:00:00') > NOW();
```
ADDTIME function in MySQL for positive and negative time:
- ADDTIME handles both positive and negative time intervals:
```
SELECT ADDTIME('12:00:00', '-01:30:00') AS updated_time;
```
Mathematical operations with ADDTIME in MySQL:
- Use ADDTIME in mathematical expressions:
```
SELECT ADDTIME(column1 * 2, '03:15:00') AS modified_time FROM table_name;
```
MySQL ADDTIME function in WHERE clause:
- Apply ADDTIME in the WHERE clause for conditional filtering:
```
SELECT * FROM tasks WHERE ADDTIME(completion_time, '02:00:00') > deadline_time;
```
ADDTIME function in MySQL for timestamp values:
- Use ADDTIME with timestamp values:
```
SELECT ADDTIME('2023-01-15 14:30:00', '05:45:00') AS new_timestamp;
```