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nfs
35,526 PointsI don't understand one thing... What do we mean by "Other Databases" ???
I mean, what do we mean by "Other Databases"? I need clarification on this... I can't google this, can I?
6 Answers
Steven Parker
231,184 PointsThe database used in the course is SQLite. The "other databases" would include PostgreSQL, MySQL, MS SQL, and Oracle.
For this particular function, two of the others work the same way as SQLite, and the alternative way to do it in the other 2 is discussed in the Teacher's Notes.
nfs
35,526 PointsThis is the thing, I don't get it... If SQL is a Programming Language, then why does it vary from database to database? I mean, Javascript doesn't vary from site to site. Then why does SQL?
Does this mean that PostgreSQL, MySQL, MS SQL, or Oracle are more like frameworks? Thank you.
Steven Parker
231,184 PointsIt's a language, but not as heavily standardized as most. The basic language elements tend to be the same, but the companies the produce software that uses it often add on custom extensions that may or may not be adopted by the others.
JavaScript, on the other hand, is one of the most standardized languages since it is used by every browser in the world.
Stephanie Youstra
18,513 PointsAnother way to think of it (for a very broad and not-necessarily the most technically accurate analogy) is to consider the idea of a "database" as analogous to "spreadsheet"/"document"/"presentation slideshow". A lot of people then refer to putting together a "PowerPoint" or an "Excel document" -- even if they're using Keynote or Google Sheets. They're the same basic software serving the same basic service, but there are differences and variations among them.
Or, (not sure if this holds) ..... if you consider that SQL means is a "Structured Query Language", then is it more appropriate to compare the idea of SQL to a broad category like "Object-Oriented Programming Language" than to a specific language like JavaScript? (So just like OOB includes Ruby, Java, C# .... SQL includes MySQL, SQLite, etc.)
nfs
35,526 PointsI see... So can I oversimplify things and say that different companies come out with different versions of SQL? Does that mean, anyone can make up a version of SQL and there's a huge possibility that it'll get accepted by developers?
Steven Parker
231,184 PointsThe existing companies have been well established for a long time. Today, a company creating a new and unique version might not be readily accepted unless it provided a great improvement in performance (or price/performance ratio).
nfs
35,526 PointsAh. That clarifies things a lot. Thank you. One last thing, if different companies came out with different versions of SQL, then why are they called "DATABASES" AND NOT "VERSIONS". Won't that be more legitimate?
Steven Parker
231,184 PointsI think the term "database" is short for "database version" or "database variant".
nfs
35,526 PointsThank you, Steven Parker.
HIDAYATULLAH ARGHANDABI
21,058 PointsHIDAYATULLAH ARGHANDABI
21,058 Pointswhen you are working on database you are working with many tables. or you may be working on two databases at same time. As i watched the video it is working on the limiting function. using this function you find the amonunt of data you want to work with