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What is the meaning of Alter Table?
The SQL ALTER TABLE command is used to modify the definition (structure) of a table by modifying the definition of its columns. The ALTER command is used to perform the following functions. 1) Add, drop, modify table columns. 2) Add and drop constraints.
What is Alter Table?
The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table.
What does the alter table clause do?
Explanation: COUNT(column_name) is used to count the number of rows of a table where column name is a column that does not allow NULL values. 5. What does the ALTER TABLE clause do ? Explanation: The ALTER TABLE statement is used to add, delete, or modify columns.
What is drop table?
Drop a Table. The drop table command is used to delete a table and all rows in the table. ... Deleting all the records in the table leaves the table including column and constraint information. Dropping the table removes the table definition as well as all of its rows.
Does alter table lock table MySQL?
1 Answer. Short answer: For MySQL < 5.6 locks are required. From 5.6 on, and using InnoDB, locks are not required for many ALTER TABLE operations including adding a column. ... Updates and writes to the table that begin after the ALTER TABLE operation begins are stalled until the new table is ready...
How do I change a table name?
Syntax(Oracle, MySQL,MariaDB): ALTER TABLE table_name RENAME TO new_table_name;
Columns can be also be given new name with the use of ALTER TABLE. Syntax(Oracle): ALTER TABLE table_name RENAME COLUMN old_name TO new_name;
Syntax(MySQL, MariaDB): ALTER TABLE table_name CHANGE COLUMN old_name TO new_name;
How do you rename a table?
Syntax(Oracle, MySQL,MariaDB): ALTER TABLE table_name RENAME TO new_table_name;
Columns can be also be given new name with the use of ALTER TABLE. Syntax(Oracle): ALTER TABLE table_name RENAME COLUMN old_name TO new_name;
Syntax(MySQL, MariaDB): ALTER TABLE table_name CHANGE COLUMN old_name TO new_name;
Can we change table name in SQL?
The SQL RENAME command is used to change the name of the table or a database object. If you change the object's name any reference to the old name will be affected. You have to manually change the old name to the new name in every reference.
What is Renamed command in SQL?
Summary. The alter command is used when we want to modify a database or any object contained in the database. The drop command is used to delete databases from MySQL server or objects within a database. The rename command is used to change the name of a table to a new table name.
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