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Chapter 14 (8i text): SQLPLUS • Variables in SQL*Plus pp. 306 – pp. 306-309 – Simplest way is to precede the variable with &. SQL*Plus then shows old value, prompts for new. && will define and preserve the value for &&. – Another way is to define the variable and assign its value at the same time define xCompany = ‘IDK’ – You can prompt the user to enter a value with ACCEPT/PROMPT: accept xCompany prompt ’Company:’ CSCI N311: Oracle Database Programming 7-1 Chapter 19 (old text): SQL*PLUS • Loading variables with a query. • You want to generate a query like this for each table in USER_TABLES select count(*) from LEDGER; • So the query is: select 'select count (*) from '|| table_name from USER_TABLES; • In a SQLPLUS script: set feedback off set heading off spool slave.sql select 'select count (*) from '|| table_name from USER_TABLES; spool off start slave.sql • Script Output: BREEDING LEDGER LODGING SKILL 16 225 6 6 CSCI N311: Oracle Database Programming 7-2 Chapter 19 (old text): SQL*PLUS • Loading/setting variables with a query. spool slave.sql select 'define average = ' , AVG(Amount) from LEDGER; spool off • When above query is ran, here is the output stored in slave.sql file: define average = 9999.99 • Then after slave.sql has been ran, &average becomes usable as if it were a constant… example: select person, amount from LEDGER where amount > &average; CSCI N311: Oracle Database Programming 7-3 Chapter 16 (8i text): SQLPLUS • Additional Facts About Variables – pp. 346-347 – &1, &2, &3… &n are start parameters. Example: start ledger.sql 01-JAN-01 01-JAN-02 Is like having this as the first 2 lines of ledger.sql: define 1 = '01-JAN-01' define 2 = '01-JAN-02‘ – . (period) ends a variable name so that it can be next to constants or SQL. – set escape sqlplus command that defines a character you can place in front of & so they can be literals. – set scan on set scan off Toggles variable scanning in your script. CSCI N311: Oracle Database Programming 7-4 Chapter 20: Changing the Oracle Surroundings • Know how to create an Index, what indexes do in general, also unique and bitmap indexes. • Know what a Tablespace is, how it differs from a table and a file. • Vocabulary: Extent, Segment. • Understand the elements of the CREATE TABLE’s storage clause. Appendix p. 1194 • Know what a Cluster is in Oracle and why you would use them. • Know what a Sequence is in Oracle and how to use them to populate values into a table. CSCI N311: Oracle Database Programming 7-5