How to write the sql statement that modifies the table name
The editor will share with you how to write the sql sentence that modifies the table name. I hope you will get something after reading this article. Let's discuss it together.
The sql statement that modifies the table name is the "ALTER TABLE" statement. The basic syntax is: "ALTER TABLE [modify options]"; the "ALTER TABLE" statement is used to modify the design of an existing table; you can add, modify, or delete columns from an existing table.
The sql statement that modifies the table name is the "ALTER TABLE" statement.
The ALTER TABLE statement is used to add, modify, or delete columns from an existing table. The Alter statement is often used to modify the structure of the Sql Server table. Some commonly used alter statements are listed as follows.
The ALTER TABLE statement is used to modify the design of an existing table.
Basic syntax: ALTER TABLE [modify options]
ALTER TABLE table ADD COLUMN field type [(size)] [NOT NULL] [constraint index] ALTER TABLE table ADD CONSTRAINT multifieldindex ALTER TABLE table DROP COLUMN fieldALTER TABLE table DROP CONSTRAINT indexname
Description:
The table parameter is used to specify the name of the table to modify.
ADD COLUMN is a reserved word for SQL, and using it adds fields to the table.
ADD CONSTRAINT is a reserved word for SQL, and using it adds an index to the table.
DROP COLUMN is a reserved word for SQL, and using it deletes fields to the table.
DROP CONSTRAINT is the reserved word of SQL, and using it will delete the index to the table.
Field specifies the name of the field to add or remove.
The type parameter specifies the data type of the newly created field.
The size parameter is used to specify the length of a text or binary field.
The indexname parameter specifies the name of the multi-field index to delete.
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