小巧。快速。可靠。
三选二。

frame-spec

GROUPS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING RANGE ROWS UNBOUNDED PRECEDING expr PRECEDING CURRENT ROW expr PRECEDING CURRENT ROW expr FOLLOWING expr PRECEDING CURRENT ROW expr FOLLOWING EXCLUDE CURRENT ROW EXCLUDE GROUP EXCLUDE TIES EXCLUDE NO OTHERS

用于：   over-clause   window-defn

参考：   expr

另请参阅：   lang_aggfunc.html   lang_altertable.html   lang_attach.html   lang_createindex.html   lang_createtable.html   lang_createtrigger.html   lang_createview.html   lang_delete.html   lang_expr.html   lang_insert.html   lang_returning.html   lang_select.html   lang_update.html   lang_upsert.html   lang_with.html   partialindex.html