Add a table to the database view

Specify the table to join to the database view.

Avant de commencer

Role required: admin.

Pourquoi et quand exécuter cette tâche

The Table field in the View Table form specifies the table to join to the database view. The Variable prefix is used by the Where clause to define the conditions for the join. These conditions can refer to any field, but typically define the join by matching a field in the table to a field in another table in the database view.

Remarque :

The Variable prefix field is mandatory.

When you write the Where clause, add the field name to the Variable prefix of its table with an underscore. In the following example, mi_id refers to the id field in the Metric Instance [metric_instance] table (mi) and inc_sys_id refers to the sys_id field in the Incident [incident] table (inc).

Figure 1. Database View Table form

Remarque :

• Database views cannot be created on tables that participate in table rotation.
• Use only lowercase characters in the Variable prefix. Using uppercase characters may prevent you from viewing the database view in a list.

To see an example of using left joins to create a view, see Example left join in creating a database view.

The Where clause supports these JavaScript conditional operators:

• =
• !=
• <
• <=
• >
• >=
• &&
• ||

There is no support for LIKE or CONTAINS conditions in the Where clause clause of a database view. Link tables based on the sys_id using the = operator to work with the full dataset when filtering lists, running glide queries, or running reports.

Procédure

1. From the Database View form, select New on the View Tables related list.
2. Configure the form and add the Left join field (a check box) to the form.
3. Select Save.
4. Complete the form and select the Left join check box.
   • Selecting Left join causes the left-hand table in the database view to display all records, even if the join condition does not find a matching record on the right-hand table. Select this check box to view tables that specify a Where clause. Selecting Left join for view tables without a Where clause does not affect the query.
   • Joined tables are ordered left to right from lowest to highest Order values.
5. Select Submit.
6. Personalize the View Tables related list to show the Left join column.
   The Left join field is true.
7. Select a record to view a table.
8. To add an OR to your Where clause, use ||.

   For example, to query all incidents related to RFCs OR all incidents that are the parent of a change request, use the syntax: inc_rfc = chg_sys_id || chg_parent = inc_sys_id.

Sujet précédent : Create a database view

Sujet suivant : Example left join in creating a database view