CREATE TABLE Statement (Microsoft Access SQL)

Creates a new table.

Note
The Microsoft Access database engine does not support the use of CREATE TABLE, or any of the DDL statements, with non-Microsoft Access database engine databases. Use the DAO Create methods instead.

Syntax

CREATE [TEMPORARY] TABLE table (field1 type [(size)] [NOT NULL] [WITH COMPRESSION | WITH COMP] [index1] [, field2type [(size)] [NOT NULL] [index2] [, …]] [, CONSTRAINT multifieldindex [, …]])

The CREATE TABLE statement has these parts:

Remarks

Use the CREATE TABLE statement to define a new table and its fields and field constraints. If NOT NULL is specified for a field, then new records are required to have valid data in that field.

A CONSTRAINT clause establishes various restrictions on a field, and can be used to establish the primary key. You can also use the CREATE INDEX statement to create a primary key or additional indexes on existing tables.

You can use NOT NULL on a single field or within a named CONSTRAINT clause that applies to either a single field or to a multiple-field named CONSTRAINT. However, you can apply the NOT NULL restriction only once to a field. Attempting to apply this restriction more than once results in a run-time error.

When a TEMPORARY table is created it is visible only within the session in which it was created. It is automatically deleted when the session is terminated. Temporary tables can be accessed by more than one user.

The WITH COMPRESSION attribute can be used only with the CHARACTER and MEMO (also known as TEXT) data types and their synonyms.

The WITH COMPRESSION attribute was added for CHARACTER columns because of the change to the Unicode character representation format. Unicode characters uniformly require two bytes for each character. For existing Microsoft® Jet databases that contain predominately character data, this could mean that the database file would nearly double in size when converted to the Microsoft Access database engine format. However, Unicode representation of many character sets, those formerly denoted as Single-Byte Character Sets (SBCS) can easily be compressed to a single byte. If you define a CHARACTER column with this attribute, data will automatically be compressed as it is stored and uncompressed when retrieved from the column.

MEMO columns can also be defined to store data in a compressed format. However, there is a limitation. Only instances of MEMO columns that, when compressed, will fit within 4096 bytes or less, will be compressed. All other instances of MEMO columns will remain uncompressed. This means that within a given table, for a given MEMO column, some data may be compressed and some data may not be compressed.

Example

This example creates a new table called ThisTable with two text fields.

  Sub CreateTableX1()
Dim dbs As Database

' Modify this line to include the path to Northwind
' on your computer.
Set dbs = OpenDatabase("Northwind.mdb")

' Create a table with two text fields.
dbs.Execute "CREATE TABLE ThisTable " _
    & "(FirstName CHAR, LastName CHAR);"

dbs.Close

End Sub

This example creates a new table called MyTable with two text fields, a Date/Time field, and a unique index made up of all three fields.

  Sub CreateTableX2()
Dim dbs As Database

' Modify this line to include the path to Northwind
' on your computer.

Set dbs = OpenDatabase("Northwind.mdb")

' Create a table with three fields and a unique
' index made up of all three fields.
dbs.Execute "CREATE TABLE MyTable " _
    & "(FirstName CHAR, LastName CHAR, " _
    & "DateOfBirth DATETIME, " _
    & "CONSTRAINT MyTableConstraint UNIQUE " _
    & "(FirstName, LastName, DateOfBirth));"

dbs.Close

End Sub

This example creates a new table with two text fields and an Integer field. The SSN field is the primary key.

  Sub CreateTableX3()
 Dim dbs As Database

' Modify this line to include the path to Northwind
' on your computer.
Set dbs = OpenDatabase("Northwind.mdb")

' Create a table with three fields and a primary
' key.
dbs.Execute "CREATE TABLE NewTable " _
    & "(FirstName CHAR, LastName CHAR, " _
    & "SSN INTEGER CONSTRAINT MyFieldConstraint " _
    & "PRIMARY KEY);"

dbs.Close

End Sub

See Also

ADD USER Statement

ALTER TABLE Statement

ALTER USER or DATABASE Statement

CONSTRAINT Clause

CREATE INDEX Statement

CREATE PROCEDURE Statement

CREATE USER or GROUP Statement

CREATE VIEW Statement

DROP Statement

DROP USER or GROUP Statement

GRANT Statement

REVOKE Statement