9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 1 Restricting and Sorting Data Kroenke, Chapter Two.

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Presentation transcript:

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 1 Restricting and Sorting Data Kroenke, Chapter Two

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 2 Topics Limiting rows selected (Where) Sorting selected rows (Order By)

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 3 Limiting Rows Selected SELECT [ DISTINCT ] { * | column [alias], … } FROMtable [ WHEREcondition (s) ] ;

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 4 Where Clause Can Compare Values in columns Literal values Arithmetic expressions, or Functions

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 5 Character Strings & Dates Enclosed in single quotation marks Character values  case sensitive Date values  –format sensitive –Default – DD-MON-YY

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 6 Comparison Operators = > >= < <= <> Syntax -- WHERE expr operator value

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 7 Examples

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 8 Other Comparison Operators BETWEEN … AND …  Between two values (inclusive) IN(list)  Matches any value in list of values LIKE  Match a character pattern IS NULL  Is a null value

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 9 LIKE Wildcards %  any sequence of zero or more characters _ (underscore)  any single character ESCAPE Option to match wildcard characters

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 10 Logical Operators AND  True if both conditions True OR  True if either condition True NOT  –True if condition False –False if condition True –Null if condition Null

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 11 Operator Precedence Rules 1.All comparison operators 2.NOT 3.AND 4.OR Override rules with parenthesis.

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 12 ORDER BY Clause Sorts rows –ASC  ascending order (default) –DESC  descending order Must be last clause in Select statement

9/29/2005From Introduction to Oracle:SQL and PL/SQL, Oracle 13 Order By Syntax SELECT expression FROM table [WHERE condition(s)] [ORDER BY {column, expr}|ASC|DESC||;