Mysql Query "this is incompatible with sql_mode = only_full_group_by" error

problem

When deploying a server-deployed server, the original SQL statement has appeared "this is incompatible with sql_mode = only_full_group_by" error.

reason

After mysql5.7.5, the default opens ONLY_FULL_GROUP_BY, so some of the previous SQL cannot be executed normally. The problem is that the SQL statement is not specified. Some results after group BY are uncertain, and this type of error will be found.

ONLY_FULL_GROUP_BY semantics isAll columns in Select Target List are clear semanticsSimply put, in this mode, the value in the target list is from the results of the aggregate function (SUM, AVG, MAX, etc.), or it comes from the value of the expression in Group By LIST.

Solution

existSELECTThe following results plus the Any_Value function, ignore the uncertainty of the address value in each name group and accept the query. like:

# before fixing
SELECT name,mobile FROM person
WHERE code='020'
group by time;

# After modification
SELECT ANY_VALUE(name),ANY_VALUE(mobile) FROM person
WHERE code='020'
group by time;

Of course, it is best to solve the return value uncertain problem, not ignore. . .

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