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Week 3. criteria must be true..

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Presentation on theme: "Week 3. criteria must be true.."— Presentation transcript:

1 week 3. criteria must be true.

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3 This is because in logic ANDs are resolved before ORs meaning the things around the AND get grouped.

4 it drops to the second and tests to see if either of the other condtions are true.

5 questions.

6 question first.

7 separately.

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9 This is the table I am going to use to introduce SQL (also called sequel).

10 Now I will go to view, click the arrow beneath and select the SQL view.

11 In SQL I wrote the code. SQL is the language behind the user interface
In SQL I wrote the code. SQL is the language behind the user interface. It is what always gets executed. You can also write the SQL directly. I need a semi-colon at the end of the SQL. show better in class. Notepad is not involved in what I am doing in Access.

12 Shows the results.

13 Here I want to show only these fields
Here I want to show only these fields. Note the field names must be names I defined when I created stu.

14 Shows the data that was retrieved and displayed.

15 Note that I am using the same type for comparison
Note that I am using the same type for comparison. The field gpa was defined as numeric and I am comparing to the number 3.

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17 Shows results but since I forgot to put major in the select I am not seeing it here.

18 I added numcr to the select so I will see it and I am now testing two conditions in an AND relationship.

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20 Now I am testing two things in an OR relationship.

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22 Now I want major CI and either of the other two.

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25 Major and gpa will be asked as a group and numcr > 20 will stand alone.

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31 I can simplify this a lot.

32 I started to simplify, but in fact I only want major = "CI" once.

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34 gpa > 3.2

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36 This is the simplified version.

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