Oracle Lpad function __ Static function

Introduction to Functions

The Lpad function fills the string with the specified character from the left. It is also understandable from its literal meaning that L is the shorthand for left, the pad is the meaning of the padding, so the lpad is the meaning of padding. edit this paragraph syntax

　　The syntax format is as follows:

Lpad (String, Padded_length, [pad_string])

　　string

Prepares the string to be filled;

　　Padded_length

The length of the string after the padding, which is the length of the string returned by the function, if the number is shorter than the length of the original string, the Lpad function will intercept the string into N characters from left to right;

　　pad_string

The padding string, which is an optional argument, is pasted to the left of a string, and if this argument is not written, the Lpad function will paste a space on the left side of the string.

　　Example 1:

Sql> Select Lpad (' ABCDE ', ten, ' X ') from dual;

Lpad (' ABCDE ', ten, ' X ')

--------------------

Xxxxxabcde

　　Example 2:

Sql> Select Lpad (' ABCDE ', ten, ' OQ ') from dual;

Lpad (' ABCDE ', ten, ' OQ ')

---------------------

Oqoqoabcde

　　Example 3:

Sql> Select Lpad (' ABCDE ', 2) from dual;

Lpad (' ABCDE ', 2)

---------------

Ab

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

corresponding to the Lpad function is the Rpad function:

The Rpad function fills the string with the specified character from the right, with the same syntax as the LPAD format:

Rpad (string,padded_length,[pad_string])

String

The string being filled

Padded_length

The length of the character, the number of strings returned, if this number is shorter than the length of the original string, the Rpad function will intercept the string into N characters from left to right;

Pad_string

is an optional argument, the string is pasted to the right of the string, and if this argument is not written, the Lpad function will paste a space on the right side of the string.

For example:

Rpad (' Tech ', 7); will return to ' tech '

Rpad (' Tech ', 2); will return ' Te '

Rpad (' Tech ', 8, ' 0 '); will return to ' tech0000 '

Rpad (' Tech on the net ', ' Z '); Will return ' Tech on ' net '

Rpad (' Tech on the net ', ' Z '); Will return ' tech on the Netz '