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In SQL, a GROUP BY statement is used to collect sets of data and organize or summarize them hierarchically. In all versions of Firebird, you can form a hierarchical grouping based on a call to an external function (UDF), but in v.1.0.x you cannot use the degree number of an output column as a grouping condition. Firebird 1.5 added the capability to GROUP BY degree and also by certain other types of expressions, including subquery expressions. Other changes in Firebird 1.5 tightened some grouping rules, removing support for certain illegal grouping syntaxes that are permitted in Firebird 1.0.x. The rules and interactions of grouping and ordering by expression are sometimes complicated to implement. The topics are covered in detail in 23. The following v.1.5 example queries the Membership table and outputs a statistic showing how many members joined in each month, by month:

SELECT MEMBER_TYPE, EXTRACT(MONTH FROM JOIN_DATE) AS MONTH_NUMBER, /* 1, 2, etc. */ F_CMONTHLONG(JOIN_DATE) AS SMONTH, /* UDF that returns month as a string */ COUNT (*) AS MEMBERS_JOINED FROM MEMBERSHIP GROUP BY MEMBER_TYPE, EXTRACT(MONTH FROM JOIN_DATE);

In this section I will examine some of the PeopleTools tables that correspond to the Oracle catalogue. It is useful for both the DBA and developer to be familiar with these tables. While the Oracle catalogue tells you what actually exists in the database, the PeopleSoft data dictionary tells you what should be there. Table 4-2 lists the principal PeopleTools tables that correspond to the Oracle catalogue. Table 4-2. Corresponding PeopleTools and Oracle Catalogue Tables

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The use of expressions is not restricted to DML, as we have already seen from their use in table definitions for computed columns. Any time you define a CHECK constraint for a table, column, or domain, you will use expressions. By nature, a CHECK constraint performs a check on one or more values; that is, it tests a predicate. Here is an example where the member s cell phone number is checked to make sure that, if it is present, it begins with a zero:

ALTER TABLE MEMBERSHIP ADD CONSTRAINT CHECK_CELLPHONE _NO CHECK (CELLPHONE_NO IS NULL OR CELLPHONE_NO STARTING WITH '0');

PSQL, the procedure language for triggers and stored procedures, makes extensive use of expressions for flow control. PSQL provides IF (<predicate>) THEN and WHILE (<predicate>) DO structures. Any predicate that can be tested as a search condition can also be a predicate for program flow condition. An important function of triggers is to test incoming new values, using expressions, and to use other expressions to transform or create values in the current row or in rows in related tables. For example, this common trigger checks whether a value is null and, if so, calls a function to create a value for it:

CREATE TRIGGER BI_MEMBERSHIP FOR MEMBERSHIP ACTIVE BEFORE INSERT POSITION 0 AS BEGIN IF (NEW.MEMBER_ID IS NULL) THEN NEW.MEMBER_ID = GEN_ID(GEN_MEMBER_ID, 1); END

1 row per table or view 1 row per column 1 row per distinct column name 1 row per view 1 row per index 1 row per index column 1 row per user

Out of the box, Firebird comes with a minimal set of internally implemented SQL functions. Although new functions get implemented from time to time, the broad view of the user community is to retain one of Firebird s main benefits: the small footprint of the server. The server s functional capabilities can be extended simply, by its ability to access functions in externally implemented libraries. Traditionally, such functions were called user-defined functions (UDFs). Correctly, they are external function libraries. In reality, most DBAs use well-tested libraries that are in common use and freely distributed.

21

CAST( ) EXTRACT( ) SUBSTRING( ) UPPER( ) GEN_ID( ) AVG( ) COUNT( ) MAX( ) MIN( ) SUM( )

Sometimes, even the streamlined new case user interface is too cumbersome. For example, if you re taking notes in a meeting where the whole team is brainstorming about user interface changes, wouldn t it be nice to quickly enter a whole bunch of cases at once That s what the speedy entry feature in FogBugz is for. To use speedy entry, click the Add Case hyperlink on the List page in FogBugz. This will open up a data entry area, as shown in Figure 2-2.

Conversion Conversion String String General Aggregating Aggregating Aggregating Aggregating Aggregating

PeopleTools Table (version 7.x or earlier)

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