SQL CONCATENATE

Sometimes it is necessary to combine together (concatenate) the results from several different fields.The syntax for CONCAT() is as follows:

CONCAT(str1, str2, str3, ...): Concatenate str1, str2, str3, and any other strings together. Please note the Oracle CONCAT() function only allows two arguments -- only two strings can be put together at a time using this function. However, it is possible to concatenate more than two strings at a time in Oracle using '||'.

Let's look at some examples. Assume we have the following table:
Table Geography

region_name	store_name
East	Boston
East	New York
West	Los Angeles
West	San Diego

Example 1:

MySQL/Oracle:
SELECT CONCAT(region_name,store_name) FROM Geography
WHERE store_name = 'Boston';

Result:
'EastBoston'

Example 2:
Oracle:
SELECT region_name || ' ' || store_name FROM Geography
WHERE store_name = 'Boston';

Result:
'East Boston'

Example 3:
SQL Server:
SELECT region_name + ' ' + store_name FROM Geography
WHERE store_name = 'Boston';

Result:
'East Boston'