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This article mainly introduces the case of input data after the creation of the table by sql, which is very detailed and has a certain reference value. Friends who are interested must read it!

After sql creates a table, you can use the ALTER TABLE statement to enter data. The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. If you need to add columns to the table, you can use the syntax "ALTER TABLE table_name ADD column_name...".

After sql creates a table, you can enter data using the ALTER TABLE statement, which is used to add, delete, or modify columns in an existing table.

To add columns to the table, use the following syntax:

ALTER TABLE table_nameADD column_name datatype

To delete columns from a table, use the following syntax (note that some database systems do not allow this way to delete columns from a database table):

ALTER TABLE table_nameDROP COLUMN column_name

Example:

Add a column named "DateOfBirth" to the Persons table.

ALTER TABLE PersonsADD DateOfBirth date above are all the contents of this article entitled "the case of entering data after creating a table by sql". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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