Why Does SQLite String Concatenation Using ' ' Return '0'?
Jan 05, 2025 am 12:08 AMUnderstanding String Concatenation in SQLite
In database queries, concatenating strings often arises, and in SQLite, this operation differs from other programming languages.
Problem Statement:
When executing an SQL query involving string concatenation using the ' ' operator, unexpected '0' results are returned.
Query in Question:
select locationname + '<p>' from location;
Incorrect Result:
A list of 0s instead of the expected string with concatenated location names and '<p>' literals.
Correct Approach:
In SQLite, string concatenation is performed using the '||' operator, unlike the ' ' operator used in other programming languages.
Corrected Query:
select locationname || '<p>' from location;
SQLite Documentation Explanation:
The SQLite documentation states that the '||' operator is explicitly used for string concatenation, joining together the two operand strings.
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