How mysql modifies the value of a column

This article mainly explains "mysql how to modify a column of values," interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "mysql how to modify a column of values"!

In mysql, you can modify the value of a column by using the Update statement. The Update statement is used to modify and update the data of one or more tables. With the WHERE condition, you can modify the data value of the specified column. The syntax is "UPDATE table name SET column name = new value WHERE column name = some value."

Operating environment of this tutorial: Windows 10 system, mysql version 8.0.22, Dell G3 computer.

How does mysql modify a column value?

In MySQL, you can use UPDATE statements to modify or update data in one or more tables.

Basic syntax for UPDATE statements

Modify a single table using the UPDATE statement with the syntax:

UPDATE SET Field1 = Value1 [, Field2 = Value2… ] [WHERE clause][ORDER BY clause] [LIMIT clause]

The syntax is explained as follows:

: Specifies the name of the table to update.

SET clause: Used to specify column names and column values to modify in a table. Where each specified column value can be an expression or a default value for that column. If default values are specified, column values can be represented with the keyword DEFAULT.

WHERE clause: optional. Used to restrict the rows in a table to be modified. If not specified, all rows in the table are modified.

ORDER BY clause: optional. Used to limit the order in which rows in a table are modified.

LIMIT clause: Optional. Used to limit the number of rows to be modified.

Note: When modifying multiple column values in a row of data, each value in the SET clause can be separated by commas.

mysql Syntax for modifying a column of values:

UPDATE Table Name SET Column Name = New Value WHERE Column Name = Some Value

Update a column in a row

We add firstname for people whose lastname is "Wilson":

UPDATE Person SET FirstName = 'beijing' WHERE LastName = 'shanghai'

Update several columns in a row

We change the address and add the city name:

UPDATE Person SET Address = 'jinqiaolu', City = 'shanghai'WHERE LastName = 'beijing' At this point, I believe everyone has a deeper understanding of "mysql how to modify a column's value", so let's actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!