SQL CONCAT (Operator ||)
SQL CONCAT (Operator ||) is a SQL function in the String Functions category. String concatenation: ANSI uses || operator. MySQL uses CONCAT function. SQL Server uses + operator. It accepts see syntax. It returns concatenated string. A close relative is CONCAT(), which concatenates two or more strings into one string. Returns NULL if any argument is NULL. A close relative is SUBSTRING(), which extracts characters from a string starting at position `start` for `length` characters. A close relative is REPLACE(), which replaces all occurrences of `from_string` with `to_string` in a string. More about this category: String manipulation — CONCAT, SUBSTRING, REPLACE, TRIM, UPPER, LOWER, LENGTH. Related String Functions entries: CONCAT(), SUBSTRING(), REPLACE(), LENGTH(), TRIM(), UPPER(), LOWER(), LPAD() / RPAD(). This page is part of the free SQL Reference documentation covering 762+ statements, functions, and clauses, each with syntax, parameters, return values, and examples for MySQL, PostgreSQL, SQL Server, and SQLite.