Diferencias

Muestra las diferencias entre dos versiones de la página.

--- informatica:base_de_datos:postgresql:postgresql_pivot [2026/01/28 04:11] – admin
+++ informatica:base_de_datos:postgresql:postgresql_pivot [2026/01/29 02:50] (actual) – admin
@@ Línea 6: / Línea 6: @@
   * [[https://www.beekeeperstudio.io/blog/how-to-pivot-in-postgresql/]]
     * [[https://rextester.com/DMRIM25761]]
-  * [[https://learnsql.com/blog/creating-pivot-tables-in-postgresql-using-the-crosstab-function/]]
+  * [[https://stackoverflow.com/questions/3002499/postgresql-crosstab-query]]
+<code postgresql>
+CREATE EXTENSION IF NOT EXISTS tablefunc;
+CREATE TABLE tbl (
+   section   text
+ , status    text
+ , ct        integer  -- "count" is a reserved word in standard SQL
+);
+INSERT INTO tbl VALUES
+  ('A', 'Active', 1),
+  ('A', 'Inactive', 2),
+  ('B', 'Active', 4),
+  ('B', 'Inactive', 5),
+  ('C', 'Inactive', 7);  -- ('C', 'Active') is missing
+SELECT *
+FROM   crosstab(
+   'SELECT section, status, ct
+    FROM   tbl
+    ORDER  BY 1,2'  -- needs to be "ORDER BY 1,2" here
+   ) AS ct ("Section" text, "Active" int, "Inactive" int);
+</code>