http://blog.yiz.name Connection strings often use " ", always let me sweat. . . It turns out that mysql is not like this. . . Concat (STR1, STR2, ...)
Returns a string from the parameter link. If any parameters are
NULL, return
NULL. It can have more than 2 parameters. A digital parameter is transformed into an equivalent string form.
MySQL> SELECT Concat ('my', 's', 'ql');
-> 'MySQL'
MySQL> SELECT Concat ('my', null, 'ql');
-> NULL
MySQL> SELECT Concat (14.3);
-> '14 .3 '
