mssqlduplicate detection

Find Duplicate Records in SQL Server with LIKE Pattern

Detect and find duplicate data records in SQL Server using LIKE pattern matching and GROUP BY. T-SQL deduplication examples.

The Regex Pattern

Regex pattern

%[a-zA-Z0-9._%+-]%@%[a-zA-Z0-9.-]%.%

Use this pattern with mssql's REGEXP operator.

mssql SQL Example

-- Use SQL Server LIKE patterns and GROUP BY with HAVING to find duplicate records in a contacts or orders table
SELECT *
FROM your_table
WHERE your_column REGEXP '%[a-zA-Z0-9._%+-]%@%[a-zA-Z0-9.-]%.%';

How This Works

Use SQL Server LIKE patterns and GROUP BY with HAVING to find duplicate records in a contacts or orders table. The regex pattern is used with mssql's REGEXP operator to filter rows at the database level.

Using regex directly in SQL is efficient for use cases like duplicate detection — it avoids loading data into application memory just to filter it with a regex.

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