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But those same systems don t let you write those same boolean expressions in a SELECT clause. In other words, the following potentially useful counterparts to Queries 1 and 2 3. SELECT ( S.CITY = 'Paris' ) AS X FROM S WHERE S.S# = S#('S2') ; 4. SELECT EXISTS ( SELECT FROM WHERE AND FROM S WHERE S.S# = S#('S2') SP.* SP SP.S# = S.S# SP.P# = P#('P2') ) AS X ;

By this point you probably have a general feeling for what a task is, but you most likely still have many questions regarding them. For example, how can new tasks be implemented Tasks actually are implemented in code, so whatever you are able to do in code you are able to accomplish in a task. This even includes showing dialog boxes and launching external applications. In the build process, you probably will not want to show dialog boxes, but you have the option if you desire.

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are typically not supported. Note: Loosely speaking, Query 3 means Is supplier S2 in Paris and Query 4 means Does supplier S2 supply part P2 I m sure you ll agree that both of these queries are useful, and it would be nice to be able to express them; but SQL products prohibit them because (if supported) they would return a result table with a column X of type BOOLEAN, and the products in question don t support that type which means, among other things, that the following CREATE TABLE is also illegal: CREATE TABLE T ( ... , X BOOLEAN , ... ) ; One last point on SQL: In fact, the SQL standard did introduce a BOOLEAN data type only 25 years after the language was first defined! with the 1999 version of the standard (SQL:1999). As far as I know, however, none of the SQL vendors (at least, none of the major ones) support it at the time of writing. Perhaps worse, it suffers from a major logical flaw: namely, it uses NULL to represent the third truth value. But that s a topic for another day.

network (SAN), they will not be asking you how to configure it; they will be asking someone on the server team Since a SAN can and will have dramatic impacts on database servers, you need to be involved in those discussions Ideally you will be invited to the table to discuss such things early on, and the more time you spend with the server team, the better chance you have to know about what changes are coming your way You are also going to frequently be needed to help the developers and the server administrators talk to and understand each other Why is that the case Well, think of yourself as the universal translator.

Normal: see abnormal. From an early IBM PL/I reference manual, circa 1969 he relational model requires all tables to be in first normal form (abbreviated 1NF). Everybody knows that. Yet few people seem to know what that requirement really means! In fact, there s a great deal of confusion on the issue, as the following definitions (taken from various sources on the Web) clearly demonstrate: If there are no repeating groups of attributes, then [the table] is in 1NF. To achieve first normal form, each field in a table must convey unique information. An entity is in first normal form if there are no attributes (or groups of attributes) that repeat for a single occurrence of the entity. First normal form [requires that you]:

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Eliminate duplicative columns from the same table. Create separate tables for each group of related data and identify each row with a unique column or set of columns (the primary key).

Note Before we discuss tasks, we will briefly discuss metadata, which is used in the task samples. Items

First Normal Form ... means the table should have no repeating groups of fields ... A repeating group is when you repeat the same basic attribute (field) over and over again. A good example of this is when you wish to store the items you buy at a grocery store ... [and the writer goes on to give an example presumably meant to illustrate the concept of a repeating group of a table called Item Table with columns called Customer, Item #1, Item #2, Item #3, and Item #4].

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