Sql updating table definition

The UPDATE statement is a Structured Query Language (SQL) statement used to change or update values in a table.

It is usually suffixed with a WHERE clause to restrict the change to a set of values that meet a specific set of criteria.

I guess I need to be much, much, much more explicit.

SET XACT_ABORT ON **--BEGIN TRANSACTION** ALTER TABLE tbl ADD d0 SMALLINT NULL ALTER TABLE tbl ADD d1 SMALLINT NULL ALTER TABLE tbl ADD d2 SMALLINT NULL GO UPDATE tbl SET d0 = 1, d1 = 2, d2 = 3 **--COMMIT TRANSACTION** SET XACT_ABORT OFF SELECT * FROm tbl SET XACT_ABORT ON BEGIN TRANSACTION IF 1=1 BEGIN --used for simplicity to illustrate condition ALTER TABLE tbl ADD d0 SMALLINT NULL ALTER TABLE tbl ADD d1 SMALLINT NULL ALTER TABLE tbl ADD d2 SMALLINT NULL EXEC('UPDATE tbl SET d0 = 1, d1 = 2, d2 = 3') END COMMIT TRANSACTION SET XACT_ABORT OFF SELECT * FROm tbl (This answer is actually ahmd0's answer, hence posting it as community wiki.

DEFAULT Specifies that the default value defined for the column is to replace the existing value in the column.

This can also be used to change the column to NULL if the column has no default and is defined to allow null values.

TOP ( ) Specifies one or more table hints that are allowed for a target table. @ When referencing the Unicode character data types nchar, nvarchar, and ntext, 'expression' should be prefixed with the capital letter ' N'.

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.

Example: SELECT * FROM TEST; SELECT * FROM TEST ORDER BY NAME; SELECT ID, COUNT(*) FROM TEST GROUP BY ID; SELECT NAME, COUNT(*) FROM TEST GROUP BY NAME HAVING COUNT(*) 2; SELECT ' ID' COL, MAX(ID) AS MAX FROM TEST UNION SELECT ' NAME', MAX(NAME) FROM TEST; SELECT * FROM TEST LIMIT 1000; SELECT * FROM (SELECT ID, COUNT(*) FROM TEST GROUP BY ID UNION SELECT NULL, COUNT(*) FROM TEST) ORDER BY 1 NULLS LAST; Backs up the database files to a file.

Objects are not locked, but the backup is transactionally consistent because the transaction log is also copied. Example: BACKUP TO 'backup.zip' Calculates a simple expression.

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