modul:m290:learningunits:lu03:loesungen:l01

Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

Link zu dieser Vergleichsansicht

Nächste Überarbeitung		 Vorhergehende Überarbeitung
modul:m290:learningunits:lu03:loesungen:l01 [2024/08/14 12:59] – angelegt vdemirmodul:m290:learningunits:lu03:loesungen:l01 [2024/10/17 12:32] (aktuell) – vdemir
Zeile 1: Zeile 1:
-====== LU03.L01 - Choose data-types ======+====== LU04.S01 - Choose data-types ======
  
- 
-===== Task a) Choose datatypes ==== 
 Which datatype would you use to store the following information? Give reason for your decision. Which datatype would you use to store the following information? Give reason for your decision.
  
-  * product-title like trousers up to 50 characters: +1. Product-title like trousers up to 50 characters: 
-    * VARCHAR(50) +  *<color #ed1c24>VARCHAR(50)</color> 
-    * Titles can be at the most 50 characters. A fix length makes not sense in that case.  +  *<color #ed1c24>Titles can be at the most 50 characters. A fix length like a simple CHAR(50) makes no sense in that case. </color>
-  * product-description up to 255 characters: +
-    * VARCHAR(255) +
-    * The description can be 255 characters, but can also be shorter. A fix length does not make sense in that case.  +
-  * stock amount: +
-    * INT or INTEGER +
-    * Floating point type is not suitable as pieces are always counted in whole numbers.   +
-  * price of each piece:  +
-    * Prices have floating point +
-    * The data-type FLOAT (5,2) should be sufficient enough as trousers are usually within a price ranger of 0.99 to 999.99.  +
-  * order date:  +
-  * date of delivery: +
-  * whether organical or not:  +
-  * usage category with only one character:+
  
-===== Solution ===== +2. Product-description up to 255 characters: 
-[[modul:m290:learningunits:lu03:loesungen:l01|Lösung]]+  *<color #ed1c24>VARCHAR(255)</color> 
 +  *<color #ed1c24>The description can be 255 characters, but can also be shorter. A fix length does not make sense in that case. </color>
  
 +3. Stock amount:
 +  *<color #ed1c24>INT or INTEGER</color>
 +  *<color #ed1c24>Floating point type is not suitable as pieces are always counted in whole numbers.  </color>
 +
 +4. Price of each piece: 
 +  *<color #ed1c24>FLOAT(6,2) or DECIMAL(6,2)</color>
 +  *<color #ed1c24>Prices have floating point</color>
 +  * <color #ed1c24>The length of (6,2) should be sufficient enough as trousers are usually within a price ranger of 0.99 to 9999.99. </color>
 +
 +5. Order date: 
 +  *<color #ed1c24>DATE or DATETIME</color>
 +  *<color #ed1c24>The type depends on whether we want to safe only the date, but also the time. </color>
 +  *<color #ed1c24>Usually in such cases to store only the order-date is enough.</color> 
 +
 +6. Date of delivery:
 +  *<color #ed1c24>DATETIME or TIMESTAMP</color>
 +  *<color #ed1c24>Regarding delivery quality the criteria punctuality might be one key element. Therefore the storage of the delivery-time is compulsory.</color>
 + 
 +7. organic or not: 
 +  *<color #ed1c24>BOOLEAN</color> 
 +  *<color #ed1c24>As there a only two possibilites to store a boolean data-type is the correct data-type. </color>
 +
 +8. Usage category with only one character:
 +  * <color #ed1c24>CHAR</color> 
 +  * <color #ed1c24>As long as there is only one character to be stored the CHAR-type will work. </color>
 +  * <color #ed1c24>Technically the CHAR-types allows all letters, digits (as letters) and special characters.</color>
  
 ===== Vocabulary ===== ===== Vocabulary =====
 ^ English ^ German ^  ^ English ^ German ^ 
-| respectively | beziehungsweise|+| to give reason for | begründen | 
 +| at the most | höchstens | 
 +| stock amount | Lagermenge | 
 +| to float | fliessen | 
 +| sufficient | ausreichend | 
 +| regarding | bezüglich | 
 +| might be | möglicherweise | 
 +| technically | im Prinzip, eigentlich |
  
  
 ---- ----
 +
 [[https://creativecommons.org/licenses/by-nc-sa/4.0/|{{https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png}}]] Volkan Demir [[https://creativecommons.org/licenses/by-nc-sa/4.0/|{{https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png}}]] Volkan Demir
  • modul/m290/learningunits/lu03/loesungen/l01.1723633184.txt.gz
  • Zuletzt geändert: 2024/08/14 12:59
  • von vdemir