Tutorial by Topics: group

Recently, new versions of MySQL servers have begun to generate 1055 errors for queries that used to work. This topic explains those errors. The MySQL team has been working to retire the nonstandard extension to GROUP BY, or at least to make it harder for query writing developers to be burned by it....

In Python, the itertools.groupby() method allows developers to group values of an iterable class based on a specified property into another iterable set of values. itertools.groupby(iterable, key=None or some function) ParameterDetailsiterableAny python iterablekeyFunction(criteria) on w...

Regular non-capturing groups allow the engine to re-enter the group and attempt to match something different (such as a different alternation, or match fewer characters when a quantifier is used). Atomic groups differ from regular non-capturing groups in that backtracking is forbidden. Once the gro...