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CONCAT
Concatenates all of the values in its argument list. If any of the arguments is NULL, the result is NULL. When PIPES_AS_CONCAT flag is on, the symbol || can be used as CONCAT as well.
Info
This function is not to be confused with GROUP_CONCAT, which is an aggregate function returning a concatenation of values passed in during aggregation.
Syntax
CONCAT(expression, [ expression, [expression ...]])
expression || expression || expression ... || expression
Arguments
- expression: any set of expressions. This may be a column name, the result of another function, or a math operation.
Return Type
The concatenated string.
Remarks
- The symbol
||can take two different roles. If thesql_modesession variable is set asPIPES_AS_CONCAT, then||is an alias for the CONCAT function else, it is an alias for logicalOR. - The value of the
sql_modevariable is checked each time||symbol is encountered. The role of the symbol changes accordingly. - When used as concatenation operator,
||symbol has a higher precedence than the logicalOR.
Examples
memsql> select concat('1', '2', '3');
+-----------------------+
| concat('1', '2', '3') |
+-----------------------+
| 123 |
+-----------------------+
memsql> select concat('1', ' ', '2', ' ', '3');
+---------------------------------+
| concat('1', ' ', '2', ' ', '3') |
+---------------------------------+
| 1 2 3 |
+---------------------------------+
memsql> select concat(first_name, " ", last_name) from BFFs;
+------------------------------------+
| concat(first_name, " ", last_name) |
+------------------------------------+
| Cecelia Cruz |
| Ari Floo |
| Skylar Rhodes |
+------------------------------------+
memsql> set @@sql_mode = PIPES_AS_CONCAT;
memsql> select 'a' || 'b' || 'c';
+-------------------+
| 'a' || 'b' || 'c' |
+-------------------+
| abc |
+-------------------+
memsql> select first_name || " " || last_name from BFFs;
+--------------------------------+
| first_name || " " || last_name |
+--------------------------------+
| Cecelia Cruz |
| Ari Floo |
| Skylar Rhodes |
+--------------------------------+
memsql> select '1 ' || concat('2 ', '3');
+---------------------------+
| '1 ' || concat('2 ', '3') |
+---------------------------+
| 1 2 3 |
+---------------------------+
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