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Mysql method to convert multiple rows into multiple columns: first query the data in the original table; then merge the multiple rows of data into the same column or different columns, such as [select name, group_concat(sore Separator '; ') as score from stu group by name].
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mysql row-column conversion is extremely frequently used in projects, especially reports in some financial projects. The most troublesome thing is converting multiple rows to multiple columns and dynamic column-row conversion. Recently, I have been studying these row conversions, and I started with the simplest row-column conversion.
First of all, the original table of sample data is as follows:
[Multiple rows into one column] (the merged data is in the same column):
select name ,group_concat(sore Separator ';') as score from stu group by name
[Multiple rows to multiple columns] (the merged data is on different columns):
SELECT name , MAX(CASE type WHEN '数学' THEN score ELSE 0 END ) math, MAX(CASE type WHEN '英语' THEN score ELSE 0 END ) English , MAX(CASE type WHEN '语文' THEN score ELSE 0 END ) Chinese FROM stu GROUP BY name
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