alter table

First the ALTER TABLE ATTACH PARTITION command incorporates an existing table into a partitioned table as a new data partition.

In addition, the CREATE TABLE and ALTER TABLE statements can be used to set locking granularity on PRIMARY KEY and UNIQUE constraints.

Note, however, that the ALTER TABLE statement only allows you to increase the inline length.

Specifies the properties of a computed column that are added to a table by using ALTER TABLE.

Use the LOCKSIZE parameter of the ALTER TABLE statement to control how locking is done for a specific table on a permanent basis.

For more information about the modifications that can be made to a table, see ALTER TABLE (Transact-SQL).

These ALTER TABLE statements should be executed with the same care as any INSERT, UPDATE, or DELETE statement that affects many rows.

DML triggers defined on tables can be also be disabled or enabled by using ALTER TABLE.

For more information, see CREATE TABLE statement, ALTER TABLE statement, DECLARE LOCAL TEMPORARY TABLE statement, and LOAD TABLE statement.

You can use the SYSTEM_USER function with DEFAULT constraints in the CREATE TABLE and ALTER TABLE statements.

SQL described tables and indexes can also be placed and moved by the corresponding ALTER TABLE or ALTER INDEX commands.

ALTER TABLE can be below as identical as original list catalog catalog found express temporarily.

ALTER TABLE permissions apply to both tables involved in an ALTER TABLE SWITCH statement.

In an ALTER TABLE. . . SWITCH operation, the lock is acquired on both the source and target tables.

The Transact-SQL ALTER TABLE. SWITCH statement lets you transfer blocks of data quickly and efficiently between partitioned tables.

Columns that do not allow null values can be added with ALTER TABLE only if they have a default specified or if the table is empty.

When an ALTER TABLE statement is run, the messages that are created by these three event notifications are merged into one.

After rebuilding the index, constraints must be manually enabled by using the ALTER TABLE CHECK CONSTRAINT statement.

Syntax 1 The ALTER TABLE statement changes table attributes (column definitions, constraints) in a table that was previously created.

Grant ALTER TABLE permission to the user on all tables that are affected by the bcp process.

Generates ALTER TABLE statements when scripting constraints.

We recommend that you create default definitions by using the DEFAULT keyword in the ALTER TABLE or CREATE TABLE statements instead.

A partition switch involves execution of an ALTER TABLE statement.

You can specify collations for each character string column using the COLLATE clause of the CREATE TABLE or ALTER TABLE statement.

Grant ALTER TABLE permission to the user on all tables that are affected by the.

For more information about the DEFAULT keyword, see ALTER TABLE (Transact-SQL) and CREATE TABLE (Transact-SQL).

ALTER TABLE can be time-consuming, and the server will not process requests referencing the table while the statement is being processed.

The ALTER TABLE statement is used to add or drop columns in an existing table.

Instead, use default definitions that you can create by using the DEFAULT keyword of ALTER TABLE or CREATE TABLE.

The changes specified in ALTER TABLE are implemented immediately.

NOCHECK CONSTRAINT is used with ALTER TABLE to disable the constraint and allow for an insert that would typically violate the constraint.

Updated the requirements for ALTER TABLE permission.

In the previous example, trigger safety fires after any DROP TABLE or ALTER TABLE event.

If the changes require modifications of the rows in the table, ALTER TABLE updates the rows.

Instead, use default definitions created using the DEFAULT keyword of ALTER TABLE or CREATE TABLE.

Columns can be renamed online using the ALTER TABLE statement.

If the new expression is invalid, the ALTER TABLE statement fails.

The ALTER COLUMN clause cannot be used on ALTER TABLE.

Before you execute the generated script reorg. sql, you need to create the ALTER TABLE statements to activate value compression.

The script below will scan for AW fact tables named using the wildcard expression %_MEASURES and scripts ALTER TABLE and REORG commands.

To enable the constraint, use the ALTER TABLE CHECK statement.

You can create a table WITH AUDIT clause or alter table ADD|DROP AUDIT clause.

Alter table scott. Dept add supplemental log group.

You cannot use ALTER TABLE on a local temporary table.

Enable any FOREIGN KEY constraints by using the ALTER TABLE CHECK CONSTRAINT statement.

"ALTER TABLE APPEND ON" enables append mode for the table.

You can add constraints to an existing table by using the ALTER TABLE statement.

ALTER TABLE is prevented whenever the statement affects a table that is currently being used by another connection.

ALTER TABLE requires exclusive access to the table.

Option of ALTER TABLE, and using the WITH CHECK option to validate them.

This property is used with the CREATE TABLE and ALTER TABLE Transact-SQL statements.

Change the column type to XML by using the ALTER TABLE statement.

For example, such constraints defined on tables that are sources of partition switching may cause an ALTER TABLE. SWITCH operation to fail.

The statements at B and C show only the col1 column because the ALTER TABLE statement has been rolled back.

In SQL Server 2005, other index options can be specified in the index_option (Transact-SQL) clause of ALTER TABLE.

This is done by ALTER TABLE statements.

For example, you cannot add and drop PRIMARY KEY or UNIQUE constraints in the same ALTER TABLE statement.

The second algorithm is used when the table is placed in APPEND mode through ALTER TABLE.

Not always alter table, alter column or alter index

In the following example, DDL trigger safety will fire whenever a DROP TABLE or ALTER TABLE event occurs in the database

By defining a PRIMARY KEY or UNIQUE constraint on a column by using CREATE TABLE or ALTER TABLE

ALTER TABLE tablenameDROP COLUMNS CONTINUE CHECKPOINT

alter table employee disable all triggers;

alter table student add constraint DEFAULT

alter table employee enable all triggers;

ALTER TABLE TABLENAME MOVE TABLESPACE TABLESPACENAME;

alter table table_name disable all triggers;

alter table name move tablespace newtablespace

Alter table parenttable drop column consname cascade constraints;

alter table table_name enable all triggers;

According to this sample, the following steps will be executed by ALTER TABLE statements

alter table mytable move tablespace myspace;

Alter table emp disable all triggers;

ALTER TABLE table-name RENAME TO new-table-name;

Alter Table Student drop column stuOther --

ALTER TABLE SALES COALESCA PARTITION;

alter table xxx modify aaa (not) null;

ALTER TABLE TEST DROP PRIMARY KEY;

alter table xxx modify aaa default

alter table test alter column b int not null

ALTER TABLE users ADD PARTITION PARTITIONS 8;

alter table tablename change columname newdefinition;

Alter table tablename alter column columnname set default defaultvalue;

Alter table A enable trigger all

alter table employeInfo add phone blob

Alter table TABLENAME drop column

Alter table TABLENAME add column

The following example demonstrates how to rename a column using the ALTER TABLE command while keeping the table fully accessible

Alter table tabname drop column colname

alter table stuInfo add constraint UQ_StuID unique (stuID)

alter table emp add constraint jfsd default 10000 for gongzi