By Hernando Bedoya; et al
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Additional resources for Advanced functions and administration on DB2 Universal Database for iSeries
Supplier_Number (SPLNBR) must be unique in the SUPPLIER file. – Product_Number (PRDNBR) must be unique in the STOCK file. Each of these identifies the primary access path and can potentially be defined as a parent key. An order should not be inserted into the ORDERHDR file unless it references an existing customer in the CUSTOMER file. This relationship identifies a referential constraint between ORDERHDR and the CUSTOMER file. A customer should not be deleted or have their customer number changed when outstanding orders for this customer exist in the ORDERHDR file.
Either specify a different file, change the file, or change the program. Then try your request again. Possible choices for replying to message . . . . . . . . : More... Press Enter to continue. F3=Exit F6=Print F9=Display message details F21=Select assistance level F12=Cancel Figure 3-9 Updating a parent key that has matching foreign keys Figure 3-10 shows how deleting from one of the files propagates to the dependent files. For example, the deletion of product number 00420 from DETAIL issues the deletion of three records in FEATURE.
4 Creating a referential constraint This section discusses the interfaces and commands that you can use to add a referential constraint and create a referential integrity network. A referential integrity network is a set of physical files linked by referential constraints. We also use the term cascade network to indicate a referential integrity network where the constraints are linked by delete cascade rules. Two interfaces are available for creating physical file (or table) constraints: The native interface that supplies the new CL command, Add Physical File Constraint (ADDPFCST), to add a physical file constraint to a database file The SQL interface that provides: – CREATE TABLE statement: Has been enhanced with the CONSTRAINT clause that allows a table constraint to be added when creating a table.
Advanced functions and administration on DB2 Universal Database for iSeries by Hernando Bedoya; et al