INSERT statement in SQL


As introduced in previous articles, the CREATE DATABASE command is used to create the database (the database), the CREATE TABLE statement to create the table, and the DELETE statement is used to delete rows from a table, so the INSERT statement in What about SQL? Readers refer to the following article of Taimienphi.vn.


The INSERT statement in SQL is used to add new data rows to a table. Users can insert data into the table in 2 ways. Refer to each method in detail in the table in the following article.

INSERT statement in SQL

Method 1: Insert data directly into the table

The syntax of the INSERT statement is:

INSERT INTO TABLE_NAME

[ (col1, col2, col3,…colN)]

VALUES (value1, value2, value3, … valueN);

Inside:

col1, col2, … colN is the name of the column in the table that you want to insert data.

While inserting a row, if you add values ​​to all table columns, you do not need to provide the column name in the SQL query. But you need to make sure the order of the values ​​is the same as the columns in the table. The INSERT query in SQL has the following form:

INSERT INTO TABLE_NAME

VALUES (value1, value2, value3, … valueN);

For example:

If you want to insert an table into the employee list, the query is:

INSERT INTO employee (id, name, dept, age, salary location) VALUES (105, ‘Srinath’, ‘Aeronautics’, 27, 33000);

Note:

When adding rows, only date characters or values ​​are enclosed in single quotes.

If inserting data into all columns, the column name may be omitted. The INSERT statement in SQL above can be written as follows:

INSERT INTO employee

VALUES (105, ‘Srinath’, ‘Aeronautics’, 27, 33000);

Method 2: Insert data into the table through the SELECT statement in SQL

The syntax for the INSERT statement in SQL is:

INSERT INTO table_name

[(column1, column2, … columnN)]

SELECT column1, column2, … columnN

FROM table_name [WHERE condition];

For example, to insert a row into the temporary employee list, the SQL query looks like this:

INSERT INTO employee (id, name, dept, age, salary location) SELECT emp_id, emp_name, dept, age, salary, location

FROM temp_employee;

If inserting data into all columns, the above INSERT statement can be written as:

INSERT INTO employee

SELECT * FROM temp_employee;

Note: Assuming the temp_employee table has columns emp_id, emp_name, dept, age, salary, location in the order provided above and has the same data type.

Important note:

1. When adding a new row, you need to make sure the data type (datatype) of the value and the column must match.

2. Follow the integrity constraints defined for the table, if any.

Thus, the article on Taimienphi.vn has just introduced you the INSERT statement in SQL. The next articles Taimienphi.vn will introduce you more DELETE statement in SQL, JOINS statement, RENAME command, … in SQL.

https://thuthuat.taimienphi.vn/lenh-insert-trong-sql-33105n.aspx
Also readers can refer to some articles on Taimienphi.vn to learn more about SQL Server such as How to deploy SQL Server through PowerShell DSC Please. Good luck !

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