Lecture Access – Tables. What are Tables? Records Fields.

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Presentation transcript:

Lecture Access – Tables

What are Tables? Records Fields

Creating a New Table Access Create Ribbon 2.Table Design

Adding Fields The name of the Field to be used throughout the Database. Field names must be unique per table. Avoid using spaces, and be careful with your spelling.

Field Data Types Data Types specify the kind of information that is going into each Field. This helps keep the data consistent, so that you can use it later in Reports and Queries. What good is a Number field if someone types text into it, right?

Field Data Types (cont.) Text Memo Number Date/Time Currency AutoNumber Yes/No Press F1 while choosing a Data Type for help on the available choices!help

Field Properties Each Field, in addition to its Data Type, has a number of Properties that can further define its behavior. A text field, for example, can be limited in its size, be required, have a default value, etc. This can help your users save time and ensure your data stays clean. Help on each Property appears here.

Field Properties (cont.) Field Size Format Decimal Places Input Mask Default Value Required These are the more common Field Properties. Your choice of Field Properties will depend on the Data Type you are modifying.

Primary Keys The AutoNumber datatype is great for primary keys because they are automatically assigned as new records are added, and cannot be changed. When you save a Table for the first time, Access will recommend you designate a Primary Key.

Viewing Table Data Toggles between Design and View mode. Double-Click

Editing Table Data “Empty” record ready for data Edit data just like Excel. Record navigation and count.

Column Width

Sorting

Access with Excel Access and Excel “talk” to each other: –Importing –Exporting –Linking

Importing from Excel

Importing from Excel (cont.) Do not import the FullName or Location columns.

Table Relationships Databases almost always have multiple tables that are all related. Customers Line Items Payments Invoices Employees

Relationships in Access Databases store the Relationships between tables to keep things straight. When a Lookup is defined for a field, a Relationship is automatically created. In Access, Relationships are displayed with the Relationships toolbar icon.

Relationships in Access

Lookup Fields Create a drop-down menu Menu choices can be linked to other tables (dynamic) or specified (static) Used to link records across tables, ie: –Invoice to Customer –Employee to Invoice Can require user to choose from your list (great for consistency)

Lookup Fields (cont.) In our Orders table, we want the ProductID field to be a drop- down choice based on the Products table. We want to show the Product Name but store the ProductID number.

Helpful Hints Always have a Primary Key ZIP Codes and Phone Numbers are Text Double-check your spelling Spaces matter, CAPS do not Percentages are Numbers, with field size Single, and.00% as inputmask Test a Lookup as soon as you make it

Close Access BEFORE you upload Temp “locked file” open Access must be closed to effectively close this file If you upload while Access is open, the database becomes damaged and unusable.