영어에서 Alter table 을 사용하는 예와 한국어로 번역
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Issue the ALTER TABLE command.
ALTER TABLE table ADD name type;
Removing the need for ALTER TABLE….
Alter table employee drop primary key;
Removing the need for ALTER TABLE….
Alter table employee drop primary key;
SQLite supports a limited subset of ALTER TABLE.
Alter table employee drop primary key;
To do this we can use ALTER TABLE statement.
ALTER TABLE is used to modify an existing table's definition.
For example, such constraints defined on tables that are sources of partition switching may cause an ALTER TABLE….
ALTER TABLE operations such as DROP COLUMN, ALTER COLUMN, ADD CONSTRAINT are omitted.
Replication failed when a column was added to the ALTER TABLE, while replicating INSERT… SELECT(CUBRIDSUS-11166)¶.
See Section 13.1.5,“CREATE TABLE Syntax”, andSection 13.1.2,“ALTER TABLE Syntax”.
You cannot issue an ALTER TABLE statement to convert a disk-based table into a memory-optimized table. .
A FULLTEXT index definition can be given either in the CREATE TABLE statement, or added later using the ALTER TABLE or CREATE INDEX commands.
To fix this disparity between column lengths, use ALTER TABLE to lengthen ActualPC from 10 characters to 15 characters.
The maximum size of the temporary file that MySQL is allowed to use while re-creating a MyISAM index(during REPAIR TABLE, ALTER TABLE, or LOAD DATA INFILE).
You can use the Transact-SQL ALTER TABLE… SWITCH statement to quickly and efficiently transfer subsets of your data in the following ways.
A FULLTEXT index definitioncan be given in the CREATE TABLE statement when a table is created, or added later using ALTER TABLE(or CREATE INDEX).
As a result of this change, range selects, full table scans, the ALTER TABLE operation, and index generation are up to 5x faster than before.
The hash index bucket count is specifiedat index create time, and can be changed using the ALTER TABLE….
Now, we can't do it with ALTER TABLE, but should use UPDATE and I haven't explained it, so use the"cut& paste" and everyone will be happy:-.
However, because there are no rows in the table against which to check the condition of this constraint, the ALTER TABLE statement succeeds.
Individual CREATE TABLE or ALTER TABLE statements can have multiple constraints that require that an index be created.
For example, such constraints defined on tables that are sources of partition switching may cause an ALTER TABLE… SWITCH operation to fail.
The syntax of the CREATE INDEX, CREATE TABLE, and ALTER TABLE statements supports the keywords ASC(ascending) and DESC(descending) on individual columns in indexes and constraints.
The hash index bucket count is specifiedat index create time, and can be changed using the ALTER TABLE… ALTER INDEX REBUILD syntax.
You can override the max degree of parallelism value for individual index operations by setting the MAXDOP index option in the CREATE INDEX, ALTER INDEX,DROP INDEX, and ALTER TABLE statements.
If the table is published for replication, you must make schema changes using the Transact-SQL statement ALTER TABLE or SQL Server Management Objects(SMO).