Updating a table in mysql Online free webcame chat vidio full time

So, the above salary+500 expression also became NULL, and it didn’t update that particular record.SELECT * FROM employee; +-----+--------+------------+--------+ | id | name | dept | salary | +-----+--------+------------+--------+ | 100 | Thomas | Technology | 5500 | | 200 | Jason | Technology | 6000 | | 300 | Mayla | Marketing | 7000 | | 400 | Nisha | Marketing | 9500 | | 500 | Randy | Technology | 6500 | | 501 | Ritu | Technology | NULL | +-----+--------+------------+--------+ Instead of specifying a static value or an expression, you can also use the keyword “DEFAULT” when you are assigning a value to a column after the SET.The following are covered in this tutorial: DESC employee; +--------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------+-------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(20) | YES | | NULL | | | dept | varchar(10) | YES | | Sales | | | salary | int(10) | YES | | NULL | | +--------+-------------+------+-----+---------+----------------+ SELECT * FROM employee; +-----+--------+------------+--------+ | id | name | dept | salary | +-----+--------+------------+--------+ | 100 | Thomas | Sales | 5000 | | 200 | Jason | Technology | 5500 | | 300 | Mayla | Technology | 7000 | | 400 | Nisha | Marketing | 9500 | | 500 | Randy | Technology | 6000 | | 501 | Ritu | Accounting | NULL | +-----+--------+------------+--------+ If you are new to My SQL, you should probably first understand My SQL basics including how to create My SQL database.

SELECT * FROM employee; +-----+--------+------------+--------+ | id | name | dept | salary | +-----+--------+------------+--------+ | 100 | Thomas | Technology | 5000 | | 200 | Jason | Technology | 5500 | | 300 | Mayla | Marketing | 7000 | | 400 | Nisha | Marketing | 9500 | | 500 | Randy | Technology | 6000 | | 501 | Ritu | Technology | NULL | +-----+--------+------------+--------+ We discussed a lot about the various practical WHERE conditions in our My SQL select command tutorial.

It is very helpful to understand how to use the WHERE clause effectively during UPDATE statement: 25 Essential My SQL Select Command Examples When you assign a value to a column after the SET, you don’t always have to specify static values. The following is a very simple expression, where it increments the salary value by 500 for all the employees in Technology department.

SELECT * FROM employee; +-----+--------+------------+--------+ | id | name | dept | salary | +-----+--------+------------+--------+ | 100 | Thomas | Technology | 5000 | | 200 | Jason | Technology | 5500 | | 300 | Mayla | Technology | 7000 | | 400 | Nisha | Technology | 9500 | | 500 | Randy | Technology | 6000 | | 501 | Ritu | Technology | NULL | +-----+--------+------------+--------+ Instead of updating all the records you can selectively update certain records based on WHERE condition.

The following example will update the employee table and assign all employee who have a salary of greater than or equal to 7000 to Marketing department.

One of the most common My SQL operation is to change an existing value of a record in a table.

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