MySQL query statistics report errors This is incompative with sql_mode = only_full_group_by
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1. Problem description
SQL query statistics abnormal
SELECT t.username,
t.police_no,
SUM(t.totalflytime) AS totalTime
FROM trackname t
WHERE t.delete_state = 1 AND t.police_no IS NOT NULL
GROUP BY t.police_no
Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'feidun.t.username' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
2. Analysis of the cause
The literal understanding is the limitation of sql_model = only_full_group_by, which causes SQL that can be checked normally in the previous MySQL version.
Reference document:
http://dev.mysql.com/doc/refman/5.7/en/sql-mode.html#sql-mode-setting
The document points out: only_full_group_by settings will not allow query fields to include non -gathering columns
3. Solution
(1) Upgrade MySQL version
(2) Complete the non -gathering column you want to query in Group By, that is, if the column [non -function] in query query in query should be in group by
SQL correct example:
SELECT t.username,
t.police_no,
SUM(t.totalflytime) AS totalTime
FROM test t
WHERE t.delete_state = 1 AND t.police_no IS NOT NULL
GROUP BY t.police_no,t.username
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