1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
String Modification Functions
=============================
CONCAT
------
The SQL standard defines a concatenation operator ( || ), which joins two or more strings into one string value.
The CONCAT(str1, str2….) function can have one or more arguments. It returns a string that is the result of concatenating the arguments.
* If arguments are non-binary strings, the result is also a non-binary string.
* If any argument is a binary string, then the result will also be a binary string.
* Numeric arguments are converted to their equivalent in binary string format.
* If any argument is NULL then it also returns NULL.
Syntax:
CONCAT(str1, str2, [,...n])
For example: ::
SELECT CONCAT('Dr', 'izzl', 'ed');
Returns: 'Drizzled' ::
SELECT CONCAT('micro', NULL, 'nel');
Returns: NULL ::
SELECT CONCAT(14.8);
Returns: '14.8'
CONCAT_WS
---------
CONCAT WS (With Separator) allows you to specify that the first argument is treated as a separator for the rest of the arguments. This argument is added between the strings to be concatenated.
* If the separator is NULL then the result is NULL.
Syntax:
CONCAT_WS(separator str1, str2,....)
For example:
SELECT CONCAT_WS(',', ' Occupation', 'First name', 'Last Name');
Returns: 'Occupation, First name, Last Name'
SELECT CONCAT_WS(',', 'First name', NULL, 'Last Name');
Returns: 'First name, Last Name'
TRIM()
Remove leading and trailing spaces
LTRIM() Remove leading spaces
RTRIM() Remove trailing spaces
|