Left-pad a string. This function pads a string on the left side with a specified string until it reaches a certain length.
LPAD(str, len [,padstr])Returns the string str, left-padded with the string padstr to a length of len characters. If str is longer than len, the return value is shortened to len characters. If padstr is omitted, the LPAD function pads spaces.
Returns NULL if given a NULL argument. If the result is empty (zero length), returns either an empty string or with , NULL.
The Oracle mode version of the function can be accessed outside of Oracle mode by using LPAD_ORACLE as the function name.
With the pad string defaulting to space:
Oracle mode:
- Right-padding instead of left-padding.
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SELECT LPAD('hello',10,'.');
+----------------------+
| LPAD('hello',10,'.') |
+----------------------+
| .....hello |
+----------------------+
SELECT LPAD('hello',2,'.');
+---------------------+
| LPAD('hello',2,'.') |
+---------------------+
| he |
+---------------------+SELECT LPAD('hello',10);
+------------------+
| LPAD('hello',10) |
+------------------+
| hello |
+------------------+SELECT LPAD('',0),LPAD_ORACLE('',0);
+------------+-------------------+
| LPAD('',0) | LPAD_ORACLE('',0) |
+------------+-------------------+
| | NULL |
+------------+-------------------+