How to use SQL statement insert

The SQL INSERT statement is used to insert data into a table. The steps include: specify the target table to list the columns to be inserted. Specify the value to be inserted (the order of values ​​must correspond to the column name)

SQL INSERT statement

The SQL INSERT statement is used to insert data into a table. Its syntax is as follows:

 <code>INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...)</code>

The following are the steps to use the INSERT statement:

1. Specify the target table: Use the INTO keyword to specify the table to insert data.
2. List the columns to be inserted: List the column names of the values ​​to be inserted in brackets.
3. Specified value: Lists the values ​​to be inserted into the specified column in parentheses. The order of values ​​must correspond to the order of column names.

Example:

Suppose we have a table called students that contains id , name and age columns. To insert a row of data into this table, we can use the following statement:

 <code>INSERT INTO students (id, name, age) VALUES (1, 'John', 21)</code>

Notes on INSERT statements:

• The inserted value must be compatible with the column's data type.
• If no columns to be inserted are specified, the value is inserted into all columns in the table.
• If the value to be inserted contains special characters (such as single quotes), you must use escape characters (\).
• You can use the DEFAULT keyword to insert the default value if the column has the default value.
• You can use a subquery or a SELECT statement in an INSERT statement to insert complex data.

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