Week 4

 This week is half way through the course. 

Briefly summarize 5 things what you have learned in the course so far.  

List at least 3 questions you still have about databases.



Comments

Post a Comment

Popular posts from this blog

Week 5

  Include in your journal entry for this week the following The web site  "Use the Index Luke"  has a page on "slow indexes".    https://use-the-index-luke.com/sql/anatomy/slow-indexes Links to an external site.   If indexes are supposed to speed up performance of query,  what does the author mean by a slow index?  Previous Next
Read more

Week 3

  What is an SQL view.  How is it similar to a table? In what ways is it different (think about primary keys,  insert, update, delete operations) ? We have completed our study of SQL for this course.  This is not to imply that we have studied everything in the language.  There are many specialized features such as calculating rolling averages, query of spatial data (data with latitude and longitude) coordinates, and more. But take a minute to think about how SQL compares to other programming languages such as Java.  What features are similar , and which are present in one language but not in the other?  For example,  Java has conditional if statements which are similar to SQL WHERE predicates,  the SELECT clause is similar to a RETURN statement in that it specifies what data or expression values are to be returned in the query result (although it is strange that a statement should specify the RETURN as the first part of a SELECT. 
Read more