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CREATE TABLE customers
(`name` varchar(40), `services` varchar(60))
INSERT INTO customers
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, SUBSTRING_INDEX(SUBSTRING_INDEX(services, ',', n.digit+1), ',', -1) service
INNER JOIN (
SELECT 0 digit UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6
) n ON LENGTH(REPLACE(services, ',' , '')) <= LENGTH(services)-n.digit
| name | service |
| mark | 4 |
| mark | 6 |
| mark | 12 |
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