What is the code to add records to mysql database?-Mysql Tutorial-php.cn

Mysql database adding record code is "INSERT INTO table name (column name 1, column name 2,... column name n) VALUES (value 1, value 2,... value n);"; when inserting data, The column names following the INSERT statement do not need to be inserted in the order defined by the table, as long as the order of the values is the same as the order of the column fields.

What is the code to add records to mysql database?

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How to add records to mysql database

In MySQL, you can use the INSERT statement to insert one or more rows of records into an existing table in the database.

Grammar format

INSERT INTO 表名 (列名1,列名2,…列名n)
VALUES (值1,值2,…值n);

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The syntax description is as follows.

Table name: Specify the name of the table to be operated on.

Column name: Specify the column name into which data needs to be inserted. If data is inserted into all columns in the table, all column names can be omitted, and INSERT

VALUES(…) can be used directly.

VALUES clause: This clause contains the list of data to be inserted. The order of data in the data list should correspond to the order of columns.

If the data is character type, single quotes or double quotes must be used, such as: "value".

Example:

View the data of the tb_courses table

mysql> SELECT * FROM tb_courses;
Empty set (0.00 sec)

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The query result shows that the current table content is empty and there is no data. Next, perform the insertion of data Operation, insert a new record in the tb_courses table, the course_id value is 1, the course_name value is "Network", the course_grade value is 3, and the info value is "Computer Network".

mysql> INSERT INTO tb_courses
    -> (course_id,course_name,course_grade,course_info)
    -> VALUES(1,&#39;Network&#39;,3,&#39;Computer Network&#39;);
Query OK, 1 rows affected (0.08 sec)

mysql> SELECT * FROM tb_courses;
+-----------+-------------+--------------+------------------+
| course_id | course_name | course_grade | course_info      |
+-----------+-------------+--------------+------------------+
|         1 | Network     |            3 | Computer Network |
+-----------+-------------+--------------+------------------+
1 row in set (0.00 sec)

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You can see that the record was inserted successfully. When inserting data, all fields of the tb_courses table are specified, so new values will be inserted for each field.

The order of the column names after the INSERT statement does not need to be the order when the tb_courses table is defined. That is, when inserting data, it is not necessary to insert in the order defined by the table, as long as the order of the values is ensured to be the same as the order of the column fields.

When using INSERT to insert data, the column name list column_list is allowed to be empty. At this time, the value list needs to specify a value for each field of the table, and the order of the values must be the same as the order in which the fields are defined in the data table. .

Example: Insert a new record in the tb_courses table, the course_id value is 2, the course_name value is "Database", the course_grade value is 3, and the info value is "MySQL". The input SQL statement and execution results are shown below.

mysql> INSERT INTO tb_courses
    -> VLAUES(2,&#39;Database&#39;,3,&#39;MySQL&#39;);
Query OK, 1 rows affected (0.08 sec)

mysql> SELECT * FROM tb_courses;
+-----------+-------------+--------------+------------------+
| course_id | course_name | course_grade | course_info      |
+-----------+-------------+--------------+------------------+
|         1 | Network     |            3 | Computer Network |
|         2 | Database    |            3 | MySQL            |
+-----------+-------------+--------------+------------------+
2 rows in set (0.00 sec)

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The INSERT statement does not specify an insertion list, only a value list. In this case, the value list specifies the inserted values for each field column, and the values must be in the same order as the fields are defined in the tb_courses table.

Note: Although you can ignore the column name of the inserted data when using INSERT to insert data, if the value does not contain the column name, the value after the VALUES keyword must not only be complete, but also the order must be the same as when the table is defined. The columns are in the same order. If the structure of the table is modified and columns are added, deleted, or their positions are changed, these operations will cause the order in which data is inserted in this way to change at the same time. If you specify column names, they will not be affected by table structure changes.

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