Welcome to my Encyclopedia

If you made it here, you found my notes page.  I read a lot of information and then I test out that information so I can put it in my own words.  After trying browser bookmarks, trello boards, evernote, plain old notebook, I'm trying this option to reference all the great stuff I read. I am not taking credit for the great content out there, I only needed a spot where I can find it again and again.   Never stop learning!

SQL

 

Quick Notes

  • Two categories of SQL statements:
    • Data Definition Language (DDL)
      • used to describe a database, to define its structure, to create its objects and to create the table's sub-objects.
      • The following list provides some examples of types of DDL statements:
        • Creating tables (CREATE command)
        • Modifying the structure of a table (ALTER command) without deleting and re-creating it, such as adding columns, removing columns or changing column definitions (for example, length or default values)
        • Removing objects (such as tables) from the database (DROP command)
        • Partitioning tables (PARTITION command)
    • Data Manipulation Language (DML)
      • used to control the information contained within the database. The following lists provides some examples of types of DML statements:
        • Adding records to a table (INSERT command)
        • Modifying information in a table (UPDATE command)
        • Removing records from a table (DELETE command)

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