TAILIEUCHUNG - Oracle SQL Plus The Definitive Guide- P50

Oracle SQL Plus The Definitive Guide- P50:Every day, computer professionals the world over wake up, travel to the office, sit down in front of a computer, and begin another day working with that database called Oracle. Programmers write queries and stored procedures. Database administrators monitor performance, make database changes, and perform other maintenance tasks. Operations people may need to back up or recover a database. | previous page page_453 next page Page 453 TAB x LE FT CE NTER R IGHT BOLD FOR MAT format_spec text variable where REPF OOTER May be abbreviated REPF. Issuing the REPFOOTER command with no parameters causes SQL Plus to display the current report footer setting. OFF Turns the report footer off but does not erase its definition. You can turn it back on again with ON. ON Turns on printing of report footers. COLx Causes any footer text following this parameter to print at the specified column position. S KIP x May be abbreviated to S and inserts the specified number of line breaks before printing any subsequent footer text. TABx TAB is similar to COL but moves you the specified number of columns relative to the current position. Negative numbers move you backwards. TAB has nothing whatsoever to do with tab characters. LE FT May be abbreviated LE and causes subsequent footer text to be printed beginning at the leftmost column of the current footer line. CE NTER May be abbreviated CE and causes subsequent footer text to be centered within the current line. The LINESIZE setting controls the line width. R IGHT May be abbreviated R and causes subsequent footer text to be printed flush right. The LINESIZE setting controls where SQL Plus thinks the right end of the line is. BOLD Makes a footer bold by printing it three times. Only text following the BOLD command is repeated on each line. There is not a NOBOLD parameter. previous page page_453 next page previous page page_454 next page Page 454 FOR MAT May be abbreviated to FOR and allows you to control how subsequent numeric data in the footer is displayed. formatspec Is a string that specifies the display format to use for subsequent numeric data in the footer. The format elements you can use here are the same as for the COLUMN command and are described in Appendix B. It is possible to specify a character format such as A20 but that has no effect on subsequent character strings. text Is any text you want to have in the .

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