How to Correctly Concatenate Strings in SQLite?

Concatenating Strings in SQLite

The replace function in SQLite expects a string as an input, which can be tricky when trying to use another field in the function. For instance, consider the following query:

select locationname + '<p>' from location;

Unexpectedly, this query returns a list of 0s instead of the desired string combination.

To resolve this issue, the ' ' operator must be replaced with '||' in SQLite when concatenating strings. The '||' operator is specifically designed for string concatenation, while the ' ' operator serves as a mathematical addition operator.

Therefore, the correct query would be:

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

This modification ensures that the query retrieves the desired string combination, as documented in the SQLite documentation:

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

By using the correct operator, developers can effectively concatenate strings within SQLite queries, enabling them to manipulate and combine text data efficiently.

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