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9/7 Lecture

by: Kayla Davis
Kayla Davis

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Wildcards, Major Key, Minor Key, Criterion
Computer Science
Class Notes
25 ?




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This 2 page Class Notes was uploaded by Kayla Davis on Tuesday September 13, 2016. The Class Notes belongs to Cpsc 1005-02 at Xavier University of Louisiana taught by in Fall 2016. Since its upload, it has received 3 views. For similar materials see Computer Science in Computer Science and Engineering at Xavier University of Louisiana.

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Date Created: 09/13/16
★ Access Documents  ○ laccdb= locked  ■ DO NOT TURN THIS ONE IN EVER­ AUTOMATIC ZERO  ★ Always sort ascending by default unless otherwise stated.  ○ Sort from design view for safeties, kiddo.  ★ Criterion­ a condition that records MUST satisfy to be included.  ★ Wildcards: symbols that represent ANY chars or group of characters (chars)  ○ *­ reps ANY collection of chars (0 or MANY characters)  ○ ?­ individual char (0 or 1)  ○ Exs.  ■ *n*  ● anything before or after 'n'  ● anything containing 'n'  ● Nia works because the first * can represent NOTHING  ● case doesn't fucking matter, kiddo  ■ T*m  ● anything between T and M  ● Tim, Tom T45m, Tm would all work  ■ J?n  ● one character or NOTHING between the letters J and N  ● Jim doesn't work because there’s not an “n”, but Jin, J1n, and Jn work  ★ Remember the [] for your criteria (where applicable)  ○ Whatever is in the brackets is your descriptive text; it will display to you.  ■ Ex.  ● [​Enter​ City] prompts you to enter any city in the database.  ○ The “Enter” is vital, or else it won’t work.  ★ Currency Data Type  ○ You can use > and < signs (criteria).  ■ >3000= greater than 3000  ■ <3000= less than 3000  ○ Dollar signs are not needed if the data field is currency.  ★ Criterion  ○ Compound Criteria­ more than one criterion that the data for which you’re searching MUST  satisfy.  ○ AND​ Criterion­ each criterion MUST be true  ■ Ex. >300 AND 11  ● $ must be greater than $300 and the client number must be 11.  ● If it’s not the primary key, it can be repeated.  ● BA # can be repeated because business analysts have several clients.  ● Works with different fields.  ○ OR ​ Criterion­  either individual criterion MUST be true  ■ Not both or all.  ■ If you want an “or,” put it in the “or” field, not the Criteria field.  ★ Sort Key­ fields on which records are sorted.  ○ Major key­ most important  ○ Minor key­ least/less important  ■ Order is important. For example, if you sort Business Analyst Number by ascending  order first and then Amount Paid by ascending order, Business Analyst Number is the  major key and Amount Paid is the minor key. Business Analyst Number will be sorted  first, THEN Amount Paid.  ■ Ex. Sort by GPA within classification.  ● Major key­ classification  ● Minor key­ GPA  Freshman  1  Freshman  2  Junior  4  Senior  1  ●  


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