Difference between revisions of "Oracle:Initial Queries"
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| + | [[Main Page]] >> [[Oracle|Oracle and SQL]] >> [[Oracle_Workbook|Workbook]] >> [[Oracle_Getting_Started|Getting Started]] >> Initial Queries | ||
| + | |||
== Initial Queries == | == Initial Queries == | ||
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Note, describe is a command proprietary to Oracle and is not part of the SQL standard. These commands are part of the Plus commands Oracle provides and do not need a semi-colon after them. | Note, describe is a command proprietary to Oracle and is not part of the SQL standard. These commands are part of the Plus commands Oracle provides and do not need a semi-colon after them. | ||
| − | == Exercise 1 == | + | == Exercise 1.1 == |
Type in the SQL code to display the structure of the CUSTOMER table. | Type in the SQL code to display the structure of the CUSTOMER table. | ||
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The result should be similar to the following: | The result should be similar to the following: | ||
| + | <pre style="color: blue"> | ||
Name Null? Type | Name Null? Type | ||
----------------------------------------- -------- ---------------------------- | ----------------------------------------- -------- ---------------------------- | ||
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DESCRIPTION VARCHAR2(20) | DESCRIPTION VARCHAR2(20) | ||
QTY NUMBER(4) | QTY NUMBER(4) | ||
| + | </pre> | ||
Type in the following commands separately: | Type in the following commands separately: | ||
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select * from salgrade; | select * from salgrade; | ||
| − | + | ⇒ Make notes on how the results differ. | |
| − | Make notes on how the results differ. | ||
== Next Step == | == Next Step == | ||
This concludes setting up the Oracle database. Return now to the [[Oracle_Workbook|Workbook]] for the next section. | This concludes setting up the Oracle database. Return now to the [[Oracle_Workbook|Workbook]] for the next section. | ||
Latest revision as of 15:50, 24 February 2016
Main Page >> Oracle and SQL >> Workbook >> Getting Started >> Initial Queries
Initial Queries
Try the following commands and exercises:
Getting Information about the Attributes of a Table
To get a description of a particular table use the DESCRIBE command.
To describe the table EMP:
describe emp
Note, describe is a command proprietary to Oracle and is not part of the SQL standard. These commands are part of the Plus commands Oracle provides and do not need a semi-colon after them.
Exercise 1.1
Type in the SQL code to display the structure of the CUSTOMER table.
The result should be similar to the following:
Name Null? Type ----------------------------------------- -------- ---------------------------- CNO NUMBER(4) ORDERDATE DATE NAME VARCHAR2(15) CITY VARCHAR2(15) COUNTRY VARCHAR2(15) PNO NUMBER(4) DESCRIPTION VARCHAR2(20) QTY NUMBER(4)
Type in the following commands separately:
describe dept
select * from dept;
select * from emp;
describe salgrade
select * from salgrade;
⇒ Make notes on how the results differ.
Next Step
This concludes setting up the Oracle database. Return now to the Workbook for the next section.
