diff --git a/_data/locales/de-DE.yml b/_data/locales/de-DE.yml
index 6b187b4..2cca9ba 100644
--- a/_data/locales/de-DE.yml
+++ b/_data/locales/de-DE.yml
@@ -74,9 +74,9 @@ post:
 # See: <http://strftime.net/>, <https://day.js.org/docs/en/display/format>
 df:
   post:
-    strftime: "%d.%m.%Y"
+    strftime: "%Y.%m.%d"
     dayjs: "DD.MM.YYYY"
-    
+
 # categories page
 categories:
   category_measure:
diff --git a/_posts/2024-01-01-sqlmüll.md b/_posts/2024-01-01-sqlmüll.md
new file mode 100644
index 0000000..a3a447b
--- /dev/null
+++ b/_posts/2024-01-01-sqlmüll.md
@@ -0,0 +1,42 @@
+---
+title: sql müll
+author: cscherr
+date: 2024-04-10 00:34:00 +0800
+categories: [Blogging, Tutorial]
+tags: [favicon]
+lang: en
+---
+
+blablabla
+
+```sql
+-- Task: Ich habe noch 3 Eier im Kühlschrank deren Haltbarkeit demnächst
+ablaufen. Welche Kuchen kann ich backen,
+-- die maximal 3 Eier und 400g Mehl verbrauchen?
+-- Task (1.2)
+SELECT g.*
+FROM GEBACK g
+JOIN (
+  SELECT G_ID
+  FROM Z_G zg
+  LEFT JOIN ZUTAT z ON zg.Z_ID = z.Z_ID
+  WHERE (z.NAME = 'Mehl' AND zg.MASSE <= 400)
+  OR (z.NAME = 'Ei' AND zg.MASSE <= 300)
+  GROUP BY G_ID
+  HAVING COUNT(DISTINCT CASE WHEN z.NAME IN ('Mehl', 'Ei') THEN z.Z_ID END) < 2
+) fltr ON g.G_ID = fltr.G_ID;
+```
+
+```sql
+SELECT * FROM GEBACK g
+  WHERE g.G_ID IN (
+    SELECT G_ID FROM (
+    SELECT G_ID, SUM(CASE WHEN NAME = 'Mehl' THEN MASSE ELSE 0 END) AS sum_mehl,
+    COUNT(DISTINCT CASE WHEN NAME IN ('Ei','Mehl') THEN Z_ID END) AS count_ingredients
+    FROM Z_G
+    WHERE NAME IN ('Mehl', 'Ei')
+    GROUP BY G_ID
+    HAVING sum_mehl <= 400 AND count_ingredients <= 2
+  ) x
+);
+```
diff --git a/_tabs/about.md b/_tabs/about.md
index ddb2bc4..d68791b 100644
--- a/_tabs/about.md
+++ b/_tabs/about.md
@@ -1,7 +1,7 @@
 ---
 # the default layout is 'page'
 icon: fas fa-info-circle
-order: 4
+order: 100
 ---
 
 > Add Markdown syntax content to file `_tabs/about.md`{: .filepath } and it will show up on this page.
diff --git a/_tabs/links.md b/_tabs/links.md
new file mode 100644
index 0000000..c87c2ee
--- /dev/null
+++ b/_tabs/links.md
@@ -0,0 +1,9 @@
+---
+# the default layout is 'page'
+icon: fas fa-info-circle
+order: 4
+---
+
+TODO
+
+[aa](./a)