Good morning all, We have 12 customer lists: CA01, CA02, .,CA12. Table: customerList +-----------+------+ | list_name | id | +-----------+------+ | CA10 | 20BE | | CA07 | 20BE | | CA11 | 20BE | | CA03 | 20BE | | CA10 | NQCR | | CA04 | NQCR | | CA02 | MVYK | | CA10 | 0BEC | | AND SO ON. | +-----------+------+ Each list has 25 to 350 customers. Same customer_id may exist in multiple lists. We need to compare CA10 list customer_ids with other 11 lists to find matching id count by list_name. The query output should be something similar below: +------+-----------+ | list_name |count | +------+-----------+ | CA05 | 60 | | CA07 | 42 | | CA01 | 35 | | CA03 | 28 | | CA09 | 15 | | AND SO ON | +-----------+------+ Can this be done with a SELECT statement without using perl or php? Thanks in advance for any help.
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