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CREATE TABLE tbl_a (a CHAR(1)); CREATE TABLE tbl_b (b CHAR(1)); INSERT INTO tbl_a VALUES ('a'), ('b'); INSERT INTO tbl_b VALUES ('b'); SELECT a, b FROM tbl_a LEFT JOIN tbl_b ON b = a; -- Returns one record SELECT a, COUNT(DISTINCT a) OVER (PARTITION BY b) FROM tbl_a LEFT JOIN tbl_b ON b = a; -- Returns two records SELECT a, COUNT(DISTINCT a) OVER (PARTITION BY IFNULL(b, '')) FROM tbl_a LEFT JOIN tbl_b ON b = a;
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