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並前往https://www.sisense.com/blog/counting-comma-delimited-values-in-postgres-mysql-amazon-redshift-and-ms-sql-server/

Counting Comma-Delimited Values in Postgres, MySQL ...

substring(product_name, comma_pos + 1, len(s)) is the part of the string that starts right after the previous comma position, and the charindex ...

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