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The first problem (INSERT into the child table) is handled by checking the values of the foreign key columns before the INSERT statement is permitted If they don t match a primary key value, the INSERT statement is rejected with an error message In Figure 11-1, this means that before a new salesperson can be added to the SALESREPS table, the office to which the salesperson is assigned must already be in the OFFICES table As you can see, this restriction makes sense in the sample database The second problem (UPDATE of the child table) is similarly handled by checking the updated foreign key value If there is no matching primary key value, the UPDATE statement is rejected with an error message In Figure 11-1, this means that before a salesperson can be reassigned to a different office, that office must already be in the OFFICES table.

The history of the SQL is intimately intertwined with the development of relational databases. Table 3-1 shows some of the early milestones in its 40-year history. The relational database concept was originally developed by Edgar Frank Ted Codd, an IBM researcher. In June 1970, Codd published an article entitled A Relational Model of Data for Large Shared Data Banks, which outlined a mathematical theory of how data could be stored and manipulated using a tabular structure. Relational databases and SQL trace their origins to this article, which appeared in the Communications of the Association for Computing Machinery.

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Again, this restriction makes sense in the sample database The third problem (DELETE of a parent row) is more complex For example, suppose you closed the Los Angeles office and wanted to delete the corresponding row from the OFFICES table in Figure 11-1 What should happen to the two child rows in the SALESREPS table that represent the salespeople assigned to the Los Angeles office Depending on the situation, you might want to: I Prevent the office from being deleted until the salespeople are reassigned I Automatically delete the two salespeople from the SALESREPS table as well I Set the REP_OFFICE column for the two salespeople to NULL, indicating that their office assignment is unknown I Set the REP_OFFICE column for the two salespeople to some default value, such as the office number for the headquarters office in New York, indicating that the salespeople are automatically reassigned to that office.

The SQL standard specifies several logical restrictions on the query that appears within the multirow INSERT statement: The query cannot contain an ORDER BY clause. It s useless to sort the query results anyway, because they re being inserted into a table that is, like all tables, unordered. The query results must contain the same number of columns as the column list in the INSERT statement (or as the entire target table, if the column list is omitted), and the data types must be compatible, column by column.

The fourth problem (UPDATE of the primary key in the parent table) has similar complexity For example, suppose for some reason you wanted to change the number of the Los Angeles office from 21 to 23 As with the previous example, the question is.

10 - Database Updates - 196 11 - Data Integrity - 211 12 - Transaction Processing - 236

Data to be inserted into a database is often downloaded from another computer system or collected from other sites and stored in a sequential file To load the data into a table, you could write a program with a loop that reads each record of the file and uses the single-row INSERT statement to add the row to the table However, the overhead of having the DBMS repeatedly execute single-row INSERT statements may be quite high If inserting a single row takes half a second under a typical system load, it s probably acceptable performance for an interactive program But that performance quickly becomes unacceptable when applied to the task of bulk loading 50,000 rows of data In this case, loading the data would require over six hours.

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