Table links—the key for the right query
Table links are fundamental for query building. You will see some different links in this section, but the most common links will be discussed in the next section because there are too many and they are used too often.
To understand table links, you need to know more about table structures.
Primary key
Every table has a primary key. Some of the tables have foreign keys too. All those keys are used for the index. Docentry is a typical primary key to link OXXX with XXXn document tables. For example, Docentry is a common key field to link OPOR with POR1, POR2 to POR12.
A primary key can be one or more fields. For a simple table one key field would be good enough. For a complicated table, two or more fields for ...
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