Function: ????? decode (condition, value 1, translation value 1, value 2, translation value 2, ... value n, translation value n, default)
FUNCTION ????????????????????????? Result
Concat ('good', 'string') ??????????????????? 'good string'
Substr ('string', 1, 3) ???????????????????? Str '
Length ('string') ????????????????????????? 6
INSTR ('string', 'r') ???????????????????????? 3
Lower ('sql course') ????????????????? 'SQL Course'
Upper ('sql course') ?????????????????? 'sql course'
INITCAP ('sql course') ??????????????? 'sql? Course'
Round (45.926, 2) ??????????????????????????? 45.93
Trunc (45.926, 2) ???????????????????????????? 45.92
MOD
(1000, 300) ???????????????????????????????? 100
?
SQL * Plus common command: SQL> Edit S
If the current directory does not exist, the S.sql file is automatically generated.
SQL> @S
The system will automatically query all tables, views, synonyms under the current user.
The @@ file name is called to make a .sql file in the .sql file.
The Save file name uses the command of the buffer to file a file mode, the default file extension is. SQL
Get file name to transfer the SQL file of the storage
START file name runs the SQL file that is transferred to the memory
SPOOL file name The "spoolery" of the various operations and execution results after this, the default file extension is .lst
Spool displays the current "spool" state
Spool OFF stop output
example:
SQL> Spool A
SQL> SPOOL
Positive leave offline to a.lst
SQL> Spool off
SQL> SPOOL
Current no fake offline
EXIT exits SQL * Plus
DESC table name display table structure
Show user displays the current connection user
Show Error Shows Error
Show all shows all 68 system variables
Edit Open the default editor, the default is notepad.exe in the Windows system, and transfer the last SQL statement in the buffer to the Afiedt.buf file for editing.
Edit file name edits the .sql files specified in the current directory.
Clear Screen Clear Current Screen Display
