Create tab_col_histgrm.sql

tab_col_histgrm.sql

@@ -0,0 +1,30 @@
+ACCEPT C CHAR PROMPT 'Enter column name (C): ';
+ACCEPT T CHAR PROMPT 'Enter table name (T): ';
+
+SELECT
+  wb,
+  cnt,
+  TO_CHAR(ROUND(100 * cnt / (MAX(cnt) OVER ()), 2), '999.00') AS rat,
+  RPAD('*', 40 * cnt / (MAX(cnt) OVER ()), '*') AS hist
+FROM
+  (
+    SELECT
+      wb,
+      COUNT(*) AS cnt
+    FROM
+      (
+        SELECT
+          WIDTH_BUCKET(r, 0, (SELECT COUNT(DISTINCT &C) FROM &T) + 1, 255) AS wb
+        FROM
+          (
+            SELECT
+              DENSE_RANK() OVER (ORDER BY &C) AS r
+            FROM
+              &T
+          )
+      )
+    GROUP BY
+      wb
+  )
+ORDER BY
+  wb;