{"id":71,"date":"2008-11-04T12:33:53","date_gmt":"2008-11-04T11:33:53","guid":{"rendered":"http:\/\/unckel.com\/blog\/?p=71"},"modified":"2019-12-07T22:29:41","modified_gmt":"2019-12-07T21:29:41","slug":"sql-zeitfenstervergleich","status":"publish","type":"post","link":"https:\/\/unckel.de\/blog\/sql-zeitfenstervergleich\/","title":{"rendered":"SQL: Zeitfenstervergleich"},"content":{"rendered":"<p>Vergleich von Zeitfenster A mit Zeitfenster B auf \u00dcberschneidung. Das ist z.B. wichtig bei Kalender-Anwendungen mit Terminen usw&#8230; Es gibt sechs F\u00e4lle dazu:<\/p>\n<pre>A            |--------|\nB1 |----|                          OK\nB2         |----|                  \u00dcberschneidung\nB3                 |----|          \u00dcberschneidung\nB4                         |----|  OK\nB5              |--|               \u00dcberschneidung\nB6      |------------------|       \u00dcberschneidung<\/pre>\n<p>A-Anfang w\u00e4re der 01.01.2008, Ende w\u00e4re der 05.05.2008<br \/>\nB-Anfang = DateStart und das Ende dann DateEnd<\/p>\n<p>Bei dieser Definition, w\u00fcrde ein Vergleich so aussehen:<\/p>\n<pre>...\nWHERE ((DateStart &gt; '2008-01-01' AND DateStart &gt; '2008-05-05')  OR\n      (DateEnd   &lt; '2008-01-01' AND DateEnd   &lt; '2008-05-05')) OR\n       DateStart IS NULL\n...<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Vergleich von Zeitfenster A mit Zeitfenster B auf \u00dcberschneidung. Das ist z.B. wichtig bei Kalender-Anwendungen mit Terminen usw&#8230; Es gibt sechs F\u00e4lle dazu: A |&#8212;&#8212;&#8211;| B1 |&#8212;-| OK B2 |&#8212;-| \u00dcberschneidung B3 |&#8212;-| \u00dcberschneidung B4 |&#8212;-| OK B5 |&#8211;| \u00dcberschneidung B6 |&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;| \u00dcberschneidung A-Anfang w\u00e4re der 01.01.2008, Ende w\u00e4re der 05.05.2008 B-Anfang = DateStart und [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71],"tags":[],"class_list":["post-71","post","type-post","status-publish","format-standard","hentry","category-webdesign"],"_links":{"self":[{"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/posts\/71","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/comments?post=71"}],"version-history":[{"count":1,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/posts\/71\/revisions"}],"predecessor-version":[{"id":838,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/posts\/71\/revisions\/838"}],"wp:attachment":[{"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/media?parent=71"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/categories?post=71"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unckel.de\/blog\/wp-json\/wp\/v2\/tags?post=71"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}