Tabelle Strom
\nSpalten sind id, Datum, Zaehlerstand<\/p>\n
Daraus eine view kreieren :<\/p>\n
select t1.Datum, ((t2.Zaehlerstand – t1.Zaehlerstand)\/(t2.Datum-t1.Datum)) as verbrauch from Strom t1, Strom t2
\nwhere t1.id = t2.id – 1<\/p>\n
Tabelle OfenBetriebsstunden
\nSpalten sind id, Datum, Pellets, Scheitholz<\/p>\n
select t1.Datum,
\n((t2.Pellets – t1.Pellets)\/(t2.Datum-t1.Datum)) as BetriebsstundenPellets,
\n((t2.Scheitholz – t1.Scheitholz)\/(t2.Datum-t1.Datum)) as BetriebsstundenScheitholz
\nfrom OfenBetriebsstunden t1, OfenBetriebsstunden t2
\nwhere t1.id = t2.id – 1<\/p>\n
Idee von :
\nhttps:\/\/stackoverflow.com\/questions\/710212\/is-there-a-way-to-access-the-previous-row-value-in-a-select-statement<\/p>\n","protected":false},"excerpt":{"rendered":"
Tabelle Strom Spalten sind id, Datum, Zaehlerstand Daraus eine view kreieren : select t1.Datum, ((t2.Zaehlerstand – t1.Zaehlerstand)\/(t2.Datum-t1.Datum)) as verbrauch from Strom t1, Strom t2 where t1.id = t2.id – 1 Tabelle OfenBetriebsstunden Spalten sind id, Datum, Pellets, Scheitholz select t1.Datum, ((t2.Pellets – t1.Pellets)\/(t2.Datum-t1.Datum)) as BetriebsstundenPellets, ((t2.Scheitholz – t1.Scheitholz)\/(t2.Datum-t1.Datum)) as BetriebsstundenScheitholz from OfenBetriebsstunden t1, OfenBetriebsstunden t2 … MySQL View erstellen, z.B. um den Stromverbrauch aus dem Z\u00e4hlerstand zu errechnen<\/span> weiterlesen<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1122","post","type-post","status-publish","format-standard","hentry","category-allgemein"],"_links":{"self":[{"href":"https:\/\/inator.at\/index.php?rest_route=\/wp\/v2\/posts\/1122","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/inator.at\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/inator.at\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/inator.at\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/inator.at\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1122"}],"version-history":[{"count":1,"href":"https:\/\/inator.at\/index.php?rest_route=\/wp\/v2\/posts\/1122\/revisions"}],"predecessor-version":[{"id":1123,"href":"https:\/\/inator.at\/index.php?rest_route=\/wp\/v2\/posts\/1122\/revisions\/1123"}],"wp:attachment":[{"href":"https:\/\/inator.at\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inator.at\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inator.at\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}