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CSE 103

CSE 103. 103 Students: Please do not log in yet. Check-in with Brian in the back. Review Days 3 and 4 in the book. Others: Please save your work and logout. Class begins at 10:20. CSE 103. Section 002: M/W 10:20am-12:10pm 216 Berkey Hall Section 004: T/R 10:20am-12:10pm 120 Anthony Hall.

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CSE 103

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  1. CSE 103 103 Students: Please do not log in yet. Check-in with Brian in the back.Review Days 3 and 4 in the book. Others: Please save your work and logout.Class begins at 10:20.

  2. CSE 103 Section 002: M/W 10:20am-12:10pm 216 Berkey Hall Section 004: T/R 10:20am-12:10pm 120 Anthony Hall

  3. CSE 103: Introduction to Information Technology • Section 002 (602): • Lead: Jo • Assistant: Erica • Section 004 (604): • Lead: Carl • Assistant: Brian http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  4. Review Questions Answer these in your groups. Refer to the textbook for Days 1 and 2 if you don’t know the answers. • What’s an RDBMS? (What does it stand for and what does that mean?) • Hint: the R is for Relational (not in the text) • What’s a record? • What’s a field? An attribute? • What does a primary key do, and why do we need one? http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  5. Introduction to Queries Answer these questions in your groups. Refer to the text for Day 3 if you don’t know the answers. • What is a query? • Why would you want to display only some of the fields for a record? • What is SQL? • What does it stand for? • What does it do? • Why are we studying SQL? http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  6. Queries and SQL • Fundamental to manipulating data • Retrieval, calculations, updating, etc. • SQL is the common query language of relational databases: all systems use it! • Learn it once, can use any database system later • SQL is not a programming language, but is a descriptive language • Dynamic Web pages make extensive use of SQL • Some queries are ONLY expressible in SQL, not in Design View in Access (or similar tools) http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  7. Basics of SQL • What is meant by the term “keyword”? • What are the two SQL keywords that must appear in every query used to retrieve data? • What is meant by the term “syntax”? • What is an example of a syntax rule in SQL? http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  8. CSE 103 Database Monitor • Click on the MySQL Interface link on the navigation bar of the 103 Student Web site • Click on Show Tables • Select the Table tbl_Movies and click on Show Table • Notice field names and data types • Browse the other tables. What do you think each is used for? http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  9. First Query: SQL SELECT, FROM • Click Run SQL at bottom of page • This window accepts any valid SQL query • Type the following:SELECT MovieID, MovieTitle, Year, TypeFROM tbl_Movies • SQL keywords are not case-sensitive • SQL field names are not case-sensitive • SQL table names ARE CASE-SENSITIVE! • ClickRun Query http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  10. First Exercise on SQL • Now by using Show Tablesto look at the makeup of the appropriate tables and by using Run SQL to construct and execute queries, produce lists of: • Only the genre names of the genre types [22] • Only names (both first and last) of the actors and directors [833887] • You may optionally write the queries down or copy them to a text/Word file • Old queries can be helpful when you take BTs http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  11. Filters in queries: SQL WHERE • Most queries used to find specific information • Find certain fields for records with a specific property • E.g., movies made in 1990; albums by They Might Be Giants, etc. • Use SQL keyword WHERE after the FROM (table) clause with condition using <, >, =, etc. • If searching text (char/varchar field types), must use "quotes" around what you’re searching for • Example:SELECT... FROM…WHERE MovieTitle = "Jaws" http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  12. Using Queries as Filters • Write SQL queries to answer the following questions: • Which movies were produced as TV-M? (39285) • Note: This is not a rating. TV-M means “TV-Movie” • What actors/directors are named (first name) Gwyneth? (15) • Which movies were produced after 2001? (23734) • The numbers in parentheses are the number of records returned by correct queries • Use your judgment as to what fields should be included • Always include something descriptive, like a name or title, plus additional information you think is useful http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  13. Boolean Operators • By using info in the text on page 3-10 to 3-12, construct queries to • Find all TV-M movies produced so far this year. (1) • Find all actors/directors with Kwan as either their first or last name. (67) • Find all genres other than drama. (21) http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  14. Searching for Text • In the text on pages 3-13 and 3-14, read the section on the LIKE operator • Write queries to • Find all movies with titles that include “tale” anywhere in the title. (942) • Find all actors/directors whose last names begin with “Wil”. (5117) • Text searching is not case-sensitive http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  15. Sorting Data: SQL ORDER BY • Often we want to sort data by certain fields (e.g., alphabetically in a rolodex) • SQL keyword: ORDER BY (always last!) • Ascending (A-Z, 0-9) assumed; can specify DESC to reverse order • Separate multiple fields with , • SELECT FirstName, LastNameFROM tbl_People WHERE LastName LIKE "Wyc%"ORDER BY LastName, FirstName DESC • Extra space in queries makes them easier to read but has no effect on how they function http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  16. Missing data and Ranges: SQL IS (NOT) NULL, BETWEEN…AND • Construct the following queries: (check the book for hints on unknown data and data ranges, e.g., years 1990-2000) • List only the movies with unknown year data. (2421) • List people with known heights, shortest first. (11578) • List only the names and heights for those between 7 and 8 feet tall, tallest first. (54) • Hint: the database doesn’t understand ‘7 feet’ http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

  17. Homework • Look at the Homework link on the Classwork page of the Web site • You will be practicing more queries with SQL • On Day 3, you will be using the Access Design View to construct queries http://www.cse.msu.edu/~cse103 U:/msu/course/cse/103

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