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COLUMN Command
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The COLUMN command shows various properties of any specified column in a table. Once this command is issued, the settings for column format put in place by this command can be used by all the SQL commands in this session. Therefore, if you re running similar reports all the time, you may find it beneficial to include the COLUMN command specifications in a file using the STORE SET command. You can use a number of options for the COLUMN command, but here s a simple example of how to use it: SQL> COLUMN dept FORMAT a15 HEADING 'Department' SQL> COLUMN cost FORMAT $9999 In the first COLUMN command, the DEPT column is specified to be up to 15 characters in length. Longer names will be truncated. It further specifies a meaningful heading under which the department names should be listed. The second COLUMN command specifies that the cost column will display a leading dollar sign.
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COMPUTE Command
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As its name indicates, the COMPUTE command is used for several types of computations, including averages, standard deviations, and so on. Here s an example of how to use this command. The SELECT collates the data for the COMPUTE command to work on: SQL> COMPUTE AVG OF sales ON district SQL> SELECT region, district, sales FROM total_sales WHERE district = 'NORTH'; SQL>
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REPFOOTER Command
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The REPFOOTER command prints specified footer text at the bottom of a report. Here s an example: SQL> REPFOOTER PAGE RIGHT 'END OF THE 1st QUARTER RESULTS REPORT'
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The REPHEADER command is similar to the REPFOOTER command, but instead of placing a footer at the bottom of your report, it places a header at the top of your report, formatted as you specify. The following example prints the report header in the top center of the first page of the report: SQL> REPHEADER PAGE CENTER '1st QUARTER RESULTS REPORT FOR 2008'
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BTITLE and TTITLE Commands
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The TTITLE command places a title at the top of each page of your report, and the BTITLE command does the same at the bottom of each page. Here are some examples to illustrate their use: SQL> TTITLE 'Annual Financial Report for the Women's Club, 2008' SQL> BTITLE '2005 Report'
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Caution
After you use the BTITLE and TTITLE commands, as well as many other SQL*Plus commands, you have to manually turn them off to prevent all the ensuing SQL commands in that session from inheriting those settings. For example, if you don t turn the title off after you create a report, all the subsequent output for any command will be printed with the same title.
Creating Command Files in SQL*Plus
Instead of using a single command each time, you can use a set of commands together by writing them to a file and then running the file. When you do this, all the SQL commands included in the file will be executed sequentially. Typing edit (or ed) at the SQL prompt will bring up your default editor (generally vi in UNIX and Notepad in Windows). Then you can type your commands, and name and save your file so you can execute the commands later on. You can set the default editor s name in either your glogin.sql or login.sql file. Of course, you can also set the default editor after you log into SQL*Plus.
Saving the SQL Buffer Contents to a File
Often when you re writing fairly complex scripts, it is useful to take the contents of the SQL buffer and save them to a file. You can then retrieve the file for use later or use it for an automated execution. The SAVE command helps you save the SQL buffer contents. Here s a simple example: SQL> SELECT username,process,sid,serial# FROM v$session WHERE status = 'ACTIVE' . SQL> SAVE status.sql Created file status.sql SQL> After you ve typed some SQL, you can just type the dot (.) character on a new line. This indicates that you re finished writing the block of SQL. When you type the SAVE filename command, the contents stored in the SQL memory buffer are saved as a file with the specified filename in this case, status.sql. Note that the SAVE command, as shown in the preceding example, uses the default CREATE option, meaning it will create a new file called status.sql. However, if you already have a file called status.sql, you must use the SAVE command with the REPLACE option. If you wish to add on to an existing file, specify the APPEND option with the SAVE command. Here are some examples: SQL> SAVE REPLACE status.sql SQL> SAVE APPEND status.sql
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