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Diagram Pane (Visual Database Tools)

The Diagram pane presents a graphic display of the tables or table-valued objects you have selected from the data connection. It also shows any join relationships among them.

In the Diagram pane you can:

  • Add or remove tables and table-valued objects and specify data columns for output.

  • Create or modify joins between tables and table-valued objects.

When you make a change in the Diagram pane, the Criteria pane and SQL pane are updated to reflect your change. For example, if you select a column for output in a table or table-valued object window in the Diagram pane, the Query and View Designer adds the data column to the Criteria pane and to the SQL statement in the SQL pane.

Each table or table-valued object appears as a separate window in the Diagram pane. The icon in the title bar of each rectangle indicates what type of object the rectangle represents, as illustrated in the following table.

Tables

Lists the tables you can add to the Diagram pane. To add a table, select it and click Add. To add several tables at once, select them and click Add.

Views

Lists the views you can add to the Diagram pane. To add a view, select it and click Add. To add several views at once, select them and click Add.

Functions

Lists the user-defined functions you can add to the Diagram pane. To add a function, select it and click Add. To add several functions at once, select them and click Add.

Local Tables

Lists tables created by queries rather than the ones that belong to the database.

Synonyms

Lists the synonyms you can add to the Diagram pane. To add a synonym, select it and click Add. To add several synonyms at once, select them and click Add.

Icon

Object type

Visual Database Tools icon

Table

Visual Database Tools icon

Query or View

Visual Database Tools icon

Linked Table

Visual Database Tools icon

User-Defined Function

Visual Database Tools icon

Linked View

Each rectangle shows the data columns for the table or table-valued object. Check boxes and symbols appear next to the names of columns to indicate how the columns are used in the query. ToolTips display information such as data type and size for columns.

The following table lists the check boxes and symbols used in the rectangle for each table or table-valued object.

Check box or symbol

Description

Visual Database Tools iconVisual Database Tools iconVisual Database Tools iconVisual Database Tools icon

Specifies whether a data column appears in the query result set (Select query) or is used in an Update, Insert From, Make Table, or Insert Into query. Select the column to add it to the results. If (All Columns) is selected, all data columns appear in the output.

The icon used with the check box changes according to the type of query you are creating. When creating a Delete query, you cannot select individual columns.

Visual Database Tools iconVisual Database Tools icon

Indicates that the data column is being used to order the query results (is part of an ORDER BY clause). The icon appears as A-Z if the sort order is ascending or Z-A if sort order is descending.

Visual Database Tools icon

Indicates that the data column is being used to create a grouped result set (is part of a GROUP BY clause) in an aggregate query.

Visual Database Tools icon

Indicates that the data column is included in a search condition for the query (is part of a WHERE or HAVING clause).

Visual Database Tools icon

Indicates that the contents of the data column are being summarized for output (are included in a SUM, AVG, or other aggregate function).

NoteNote

Query and View Designer will not display data columns for a table or table-valued object if you do not have sufficient access rights to it or if the database driver cannot return information about it. In such cases, the Query and View Designer displays only a title bar for the table or table-structured object.

If the query involves a join, a join line appears between the data columns involved in the join. If the joined data columns are not displayed (for example, the table or table-valued object window is minimized or the join involves an expression), the Query and View Designer places the join line in the title bar of the rectangle representing the table or table-valued object. The Query and View Designer displays one join line for each join condition.

The shape of the icon in the middle of the join line indicates how the tables or table-structured objects are joined. If the join clause uses an operator other than equal (=), the operator is displayed in the join line icon. The following table lists the icons that can be displayed in a join line.

Join line icon

Description

Visual Database Tools icon

Inner join (created using equal sign).

Visual Database Tools icon

Inner join based on the "greater than" operator. (The operator displayed in the join line icon reflects the operator used in the join.)

Visual Database Tools icon

Outer join in which all rows from the table represented on the left will be included, even if they do not have matches in the related table.

Visual Database Tools icon

Outer join in which all rows from the table represented on the right will be included, even if they do not have matches in the related table.

Visual Database Tools icon

A full outer join in which all rows from both tables will be included, even if they do not have matches in the related table.

Icons on the ends of the join line indicate the type of join. The following table lists the types of joins and the icons that can be displayed on the ends of the join line.

Icon on ends of join line

Description

Visual Database Tools icon

One-to-one join

Visual Database Tools icon

One-to-many join

Visual Database Tools icon

Query and View Designer cannot determine join type

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