[英]How to join two tables that has one to many relationship in bigquery
考慮下面的查詢,
SELECT s.*, m.Mark_Details
FROM student_table s
JOIN (
SELECT student_ID,
STRING_AGG('' || Subject_ID || ':' || Subject_Name || ':' || Mark, ' | ') AS Mark_Details
FROM mark_table
GROUP BY 1
) m USING (student_ID)
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