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Just as the delete rule tells the DBMS what to do when a user tries to delete a row of the parent table, the update rule tells the DBMS what to do when a user tries to update the value of one of the primary key columns in the parent table. Again, there are four possibilities, paralleling those available for delete rules: RESTRICT update rule The RESTRICT update rule prevents you from updating the primary key of a row in the parent table if that row has any children. An UPDATE statement that attempts to modify the primary key of such a parent row is rejected with an error message. Changes to primary keys in the parent table are thus restricted to rows without any children. Applied to Figure 11-1, this rule can be summarized as You can t change an office number if salespeople are assigned to the office. CASCADE update rule The CASCADE update rule tells the DBMS that when a primary key value is changed in a parent row, the corresponding foreign key value in all of its child rows should also automatically be changed in the child table, to match the new primary key. For Figure 11-1, this rule can be summarized as Changing an office number automatically changes the office number for all the salespeople assigned to that office.

Figure 5-2.

Part III:

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The objects in a SQL-based database are identified by assigning them unique names. Names are used in SQL statements to identify the database object on which the statement should act. The most fundamental named objects in a relational database are table names (which identify tables), column names (which identify columns), and user names (which identify users of the database); conventions for naming these objects were specified in the original SQL1 standard. The ANSI/ISO SQL2 standard significantly expanded the list of named entities, to include schemas (collections of tables), constraints (restrictions on the contents of tables and their relationships), domains (sets of legal values that may be assigned to a column), and several other types of objects. Many SQL implementations support additional named objects, such as stored procedures, primary key/foreign key relationships, data entry forms, and data replication schemes. The original ANSI/ISO standard specified that SQL names must contain 1 to 18 characters, must begin with a letter, and may not contain any spaces or special punctuation characters. The SQL2 standard increased the maximum to 128 characters. In practice, the names supported by SQL-based DBMS products vary significantly. It s common to see tighter restrictions on names that are connected to other software outside of the database (such as user names, which may correspond to login names used by an operating system), and looser restrictions on names that are private to the database. The various products also differ in the special characters they permit in table names. For portability, it s best to keep names relatively short and to avoid the use of special characters.

SET NULL update rule The SET NULL update rule tells the DBMS that when a primary key value in a parent row is updated, the foreign key values in all of its child rows should automatically be set to NULL Primary key changes in the parent table thus cause a set to NULL update on selected columns of the child table For the tables in Figure 11-1, this rule can be summarized as If an office number is changed, indicate that the current office assignment of its salespeople is unknown SET DEFAULT update rule The SET DEFAULT update rule tells the DBMS that when a primary key value in a parent row is updated, the foreign key values in all of its child rows should automatically be set to the default value for that particular column.

users migrate to the new, standardized form of the data type, and the DBMS vendor can begin the process of obsoleting the proprietary version Date/time data provides an excellent example of this phenomenon and the data type variations it creates DB2 has long offered support for three different date/time data types: DATE, which stores a date like June 30, 1991, TIME, which stores a time of day like 12:30 PM, and TIMESTAMP, which is a specific instant in history, with a precision down to the nanosecond Specific dates and times can be specified as string constants, and date arithmetic is supported.

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