String concatenation does not work in SQLite

Question

Try using || in place of +

select  locationname || '<p>' from location;

From SQLite documentation:

The || operator is "concatenate" - it joins together the two strings of its operands.

The || operator is the concatenation in SQLite. Use this code:

select  locationname || '<p>' from location;

For comparison,

SQLite                      ||  
Oracle                      CONCAT(string1, string2) or ||
MySQL                       CONCAT(string1, string2, string3...) or || if PIPES_AS_CONCAT enabled
Postgres                    CONCAT(string1, string2, string3...) or ||
Microsoft SQL Server 2012+  CONCAT(string1, string2, string3...) or + 
Microsoft Access            +  

for Visual Studio 2010, using the Data Sources designer or wizard, you're in trouble using || operator. Create a view in the sqlite db and create your data source(s) from that.

See also this thread.