Add, update, and delete data

First, add data

1, add all the fields in the data table

A method, add the specified field data table

INSERT INTO table name (field 1, field names, .......)

VALUES (value 1, value 2, ......);

The second method to add all the fields in the data table

INSERT INTO table name VALUES (value 1, value 2, .......); (To be consistent with the value of the field name in the table)

2. while adding many records INSERT INTO table VALUES

(Value 1, value 2 and value 3),

……

(Value 1, value 2, ......);

INSERT INTO table for the specified field name (field 1, field 2) VALUES

(Value 1, value 2),

……

(Value 1, value 2);

update data

MySQL use an UPDATE statement to update records in the table, the basic syntax:

SET UPDATE table field name value 1 = 1 [, field name value of 2 = 2, ...] [the WHERE Conditional Expression];

/ * Field names 1 to specify the name of the field to be updated, the value of the new data field updated 1 is used to represent, WHERE conditional expression is optional and is used to specify the conditions to be met to update data * /

UPDATE update some data

First, use the View statement, execution results are as follows:

Use the following UPDATE statement to update this record

If there are many records satisfy the conditional expression in the WHERE clause, the records meet the conditions will occur updates.

From the query results, grade field values are changed to 100, indicating that the records that satisfy the WHERE clause conditional expressions are updated successfully.

UPDATE update all data

The field values are updated to grade 80, UPDATE statement is as follows, performs data update statement in the table, and then view the updated records.

delete data

Use of MySQL DELETE statement to delete records in the table, its syntax is as follows:

DELETE FROM table [the WHERE Conditional Expression];

/ * Specify the table name table to perform the delete operation, WHERE optional parameter to specify the conditions to delete, record satisfies the criteria will be deleted * /

DELETE delete some data

It refers to delete part of the data according to specified conditions to delete a table or a certain number of records, the WHERE clause need to delete the specified record condition.

首先使用查询语句查看，执行结果如下：