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This is usually an informal process that involves discussions with user groups, a study of the current operating environment and how it is expected to change, analysis of any available documentation on existing applications that are expected to be replaced or complemented by the database, and so on Several methodologies have been proposed for organizing and presenting the information gathered in this step, and some automated tools have been developed to support this process (2) Conceptual Database Design: The information gathered in the requirements analysis step is used to develop a high-level description of the data to be stored in the database, along with the constraints that are known to hold over this data This step is often carried out using the ER model, or a similar high-level data model, and is discussed in the rest of this chapter (3) Logical Database Design: We must choose a DBMS to implement our database design, and convert the conceptual database design into a database schema in the data model of the chosen DBMS We will only consider relational DBMSs, and therefore, the task in the logical design step is to convert an ER schema into a relational database schema We discuss this step in detail in 3; the result is a conceptual schema, sometimes called the logical schema, in the relational data model

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GET employeesname | employeeschildrenLASTeducationschoolname="St Mary"

You can also change the value of a variable later in the program. That is why they re called variables; their values can vary, and that s what makes them useful.

GET employeesname | employee IN BROOM(LASTeducation,schoolname="St Mary")

int myVariable; // some other code here myVariable = 15; // assign 15 to myVariable // some other code here myVariable = 12; // now it is 12

Now employees is the controlling variable and the descendants or ancestors can be tested for the validity of the predicate When multiple predicates have to be combined, brooms can provide more exibility, since the access path does not have to be speci ed segment by segment We want to locate the employees who have children at St Mary s and at UC Berkeley The simple question

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Technically, a variable is a named storage location (that is, stored in memory) with a type. After the final line of code in the previous example, the value 12 is stored in the named location myVariable. Example 3-1 illustrates the use of variables. To test this program, open Visual Studio .NET and create a console application, just as you did with Hello World in 1. Type in the code shown in bold in Example 3-1.

GET employeesname | LAST educationschoolname="St Mary" LAST educationschoolname="UC Berkeley"

using using using using System; System.Collections.Generic; System.Linq; System.Text;

ER modeling is sometimes regarded as a complete approach to designing a logical database schema This is incorrect because the ER diagram is just an approximate description of the data, constructed through a very subjective evaluation of the information collected during requirements analysis A more careful analysis can often re ne the logical schema obtained at the end of Step 3 Once we have a good logical schema, we must consider performance criteria and design the physical schema Finally, we must address security issues and ensure that users are able to access the data they need, but not data that we wish to hide from them The remaining three steps of database design are brie y described below: 1

does not make sense; if one predicate is true, the other one is false, and the result of this query will always be NULL Using a BROOM clause allows precision:

namespace Example_3_1_ _ _ _Using_variables { class Values { static void Main( )

GET employees IN BROOM(LAST educationschoolname="St Mary") IN BROOM(LAST educationschoolname="UC Berkeley")

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using a simpli ed form of the query retrieval speci cations to obtain complete segments The quali cation is now brought to the level of the employee Similar action is required if we are interested only in employees of the assembly department

{ int myInt = 7; System.Console.WriteLine("Initialized, myInt: {0}", myInt); myInt = 5; System.Console.WriteLine("After assignment, myInt: {0}", myInt); } } }

GET employees IN BROOM(departmentname="Assembly") IN BROOM(LAST educationschoolname="St Mary") IN BROOM(LAST educationschoolname="UC Berkeley")

Press Ctrl-F5, or select Debug Start Without Debugging to build and run this application. As we mentioned in 1, if you press F5, the console window will disappear almost immediately; using Ctrl-F5 allows the window to stick around so that you can read it. The output looks like this:

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The quali cation can be at a di erent level than the object being retrieved We can ask which employees have children who went to St Mary s and reform school

Initialized, myInt: 7 After assignment, myInt: 5

GET employees IN BROOM(children IN BROOM(educationschoolname="St Mary") IN BROOM(educationschoolname="Reform school") )

Example 3-1 initializes the variable myInt to the value 7, displays that value, reassigns the variable with the value 5, and displays it again.

Failing to specify children would also retrieve employees with one child in Reform school and another child in St Mary s These expressions may combine segments from di erent levels The question above, Which employee has children at UC Berkeley who are younger than 18 years old is stated as

C# requires definite assignment; you have to initialize a variable, or assign a value to it, before you can use it that is, before you can output it or manipulate it in any way. To test this rule, change the line that initializes myInt in Example 3-1 to:

GET employees IN BROOM(children IN BROOM(LASTeducationschoolname="UC Berkeley") childrenage c < 18 )

int myInt;

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