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SQL

SQL. Data Manipulation Language (DML) SELECT. SQL DML - SELECT. SELECT [DISTINCT|ALL] {* | [col-expr][,...] FROM table-name [alias] [,...] [WHERE condition] ORDER BY colm [, colm]. SQL DML - SELECT. SELECT attributes (or calculations: +, -, /, *) FROM relation

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SQL

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  1. SQL • Data Manipulation Language (DML) • SELECT

  2. SQL DML - SELECT • SELECT [DISTINCT|ALL] {* | [col-expr][,...] FROM table-name [alias] [,...] [WHERE condition] ORDER BY colm [, colm]

  3. SQL DML - SELECT • SELECT attributes (or calculations: +, -, /, *) FROM relation • SELECT DISTINCT attributes FROM relation

  4. Examples • SELECT stuname FROM student; • SELECT stuid, stuname, credit FROM student; • SELECT stuid, stuname, credit+10 FROM student; • SELECT DISTINCT major FROM student;

  5. SQL DML - SELECT • SELECT attributes (or * wild card) FROM relation WHERE condition

  6. Examples • SELECT * FROM student; • SELECT stuname, major, credit FROM student WHERE stuid = ‘S114’; • SELECT * FROM faculty WHERE dept = ‘MIS’;

  7. SELECT - WHERE condition • AND OR • NOT IN • NOT IN BETWEEN • IS NULL IS NOT NULL • LIKE '%' multiple characters • LIKE ‘_’ single characters

  8. Examples • SELECT * FROM faculty WHERE dept = ‘MIS’ AND rank = ‘full professor’; • SELECT * FROM faculty WHERE dept = ‘MIS’ OR rank = ‘full professor’; • SELECT * FROM faculty WHERE dept = ‘MIS’ NOT rank = ‘full professor’;

  9. SELECT * FROM class WHERE room LIKE ‘B_S%’; • SELECT * FROM class WHERE room NOT LIKE ‘BUS%’; • SELECT productid, productname FROM inventory WHERE onhand BETWEEN 50 and 100;

  10. SELECT companyid, companyname FROM company WHERE companyname BETWEEN ‘G’ AND ‘K’; • SELECT productid, productname FROM inventory WHERE onhand NOT BETWEEN 50 and 100; • SELECT companyid, companyname FROM company WHERE companyname NOT BETWEEN ‘G’ AND ‘K’;

  11. SELECT facname FROM faculty WHERE dept IN (‘MIS’, ‘ACT’); • SELECT facname FROM faculty WHERE rank NOT IN (‘assistant’, ‘lecture’); • SELECT customername FROM customer WHERE emailadd IS NOT NULL;

  12. SELECT customername FROM customer WHERE creditlimit IS NULL;

  13. SELECT - ORDER BY • ORDER BY • ORDER BY ... DESC

  14. Examples • SELECT facname, rank FROM faculty ORDER BY facname; • SELECT facname, rank FROM faculty ORDER BY rank DESC, facname;

  15. SELECT - JOIN Tables • Multiple tables in FROM clause • MUST have join conditions!!!

  16. Examples • SELECT stuname, grade FROM student, enrollment WHERE student.stuid = enrollment.stuid;

  17. SELECT enrollment.course#, stuname, major FROM class, enrollment, student WHERE class.course# = enrollment.course# AND enrollment.stuid = student.stuid AND facid = ‘F114’ ORDER BY enrollment.course#;

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