Using SQL to create some festive Christmas Trees
Here are a few examples I found on the “great internet” of how SQL can be used to create some festive Christmas cheer and fun. See links to the original posts. Most of the examples shown below have been run on Oracle 21c Docker image, or on SQL Server or MySQL.
Our first example comes from Gerald Venzi who posted this on twitter. See later in the post for Christmas trees created using similar SQL queries.
WITH tree(lev, xmas) AS (
SELECT 1 lev, RPAD(' ', 10, ' ') || '*' xmas
FROM dual
UNION ALL
SELECT tree.lev+1,
RPAD(' ', 10-tree.lev, ' ') ||
RPAD('^', tree.lev+1, '^') ||
LPAD('^', tree.lev, '^') xmas
FROM tree
WHERE tree.lev < 10
)
SELECT ' Merry Christmas!' AS "Merry Christmas!" FROM dual
UNION ALL
SELECT xmas FROM TREE
UNION ALL
SELECT ' | |' FROM dual
UNION ALL
SELECT ' ~~/ \~~' FROM dual;
Our next example includes using Spatial Data on SQL Server to create a Christmas Tree. This example comes from Niket Kedia.
USE tempdb
GO
— Create a table
CREATE TABLE #xmasTREE (shape GEOMETRY )
–Creating the Christmas tree with stars
INSERT INTO #xmasTREE
VALUES
(‘POLYGON((4 0, 0 0, 4 2, 1 2, 4 4, 1 4, 4 6, 2 6, 5 10, 8 6, 6 6, 9 4, 6 4, 9 2, 6 2, 10 0, 4 0))’ ),
(‘POLYGON((3.5 0, 4 -1, 6 -1, 6.5 0, 3.5 0))’ ),
(‘POLYGON((5 9.5, 4.5 9.25, 4.6 9.9, 4.1 10.2, 4.8 10.2, 5 10.9, 5.2 10.2, 5.9 10.2, 5.4 9.9, 5.5 9.25, 5 9.5))’ ),
(‘POLYGON((2 5.5, 1.5 5.25, 1.6 5.9, 1.1 6.2, 1.8 6.2, 2 6.9, 2.2 6.2, 2.9 6.2, 2.4 5.9, 2.5 5.25, 2 5.5))’ ),
(‘POLYGON((8 5.5, 7.5 5.25, 7.6 5.9, 7.1 6.2, 7.8 6.2, 8 6.9, 8.2 6.2, 8.9 6.2, 8.4 5.9, 8.5 5.25, 8 5.5))’ ),
(‘POLYGON((1 3.5, 0.5 3.25, 0.6 3.9, 0.1 4.2, 0.8 4.2, 1 4.9, 1.2 4.2, 1.9 4.2, 1.4 3.9, 1.5 3.25, 1 3.5))’ ),
(‘POLYGON((9 3.5, 8.5 3.25, 8.6 3.9, 8.1 4.2, 8.8 4.2, 9 4.9, 9.2 4.2, 9.9 4.2, 9.4 3.9, 9.5 3.25, 9 3.5))’ ), (‘POLYGON((1 1.5, 0.5 1.25, 0.6 1.9, 0.1 2.2, 0.8 2.2, 1 2.9, 1.2 2.2, 1.9 2.2, 1.4 1.9, 1.5 1.25, 1 1.5))’ ), (‘POLYGON((9 1.5, 8.5 1.25, 8.6 1.9, 8.1 2.2, 8.8 2.2, 9 2.9, 9.2 2.2, 9.9 2.2, 9.4 1.9, 9.5 1.25, 9 1.5))’ ),
(‘POLYGON((0 -0.5, -0.5 -0.75, -0.4 -0.1, -0.9 0.2, -0.2 0.2, 0 0.9, 0.2 0.2, 0.9 0.2, 0.4 -0.1, 0.5 -0.75, 0 -0.5))’ ),
(‘POLYGON((10 -0.5, 9.5 -0.75, 9.6 -0.1, 9.1 0.2, 9.8 0.2, 10 0.9, 10.2 0.2, 10.9 0.2, 10.4 -0.1, 10.5 -0.75, 10 -0.5))’ ),
(‘POLYGON((5 -2, 4.5 -2, 4.5 -1, 5 -1, 5.5 -1, 5.5 -2, 5 -2))’)
–Create the “Merry Christmas” greetings
INSERT INTO #xmasTREE
VALUES (‘POLYGON((-2 11, -2 12, -1.75 12, -1.5 11.5, -1.25 12, -1 12, -1 11, -1.25 11, -1.25 11.7, -1.5 11.2, -1.75 11.7, -1.75 11, -2 11))’ ),–M
(‘POLYGON((-1 11, -1 12, 0 12, 0 11.8, -0.75 11.8, -0.75 11.6, -0.25 11.6, -0.25 11.4, -0.75 11.4, -0.75 11.2, 0 11.2, 0 11, -1 11))’ ),–E
(‘POLYGON((0 11, 0 12, 1 12, 1 11.5, 0.4 11.5, 1 11, 0.7 11, 0.2 11.4, 0.2 11, 0 11),(0.2 11.8, 0.8 11.8, 0.8 11.7, 0.2 11.7, 0.2 11.8))’ ),–R
(‘POLYGON((1 11, 1 12, 2 12, 2 11.5, 1.4 11.5, 2 11, 1.7 11, 1.2 11.4, 1.2 11, 1 11),(1.2 11.8, 1.8 11.8, 1.8 11.7, 1.2 11.7, 1.2 11.8))’ ),–R
(‘POLYGON((2 12, 2.2 12, 2.5 11.6, 2.8 12, 3 12, 2.6 11.5, 2.6 11, 2.4 11, 2.4 11.5, 2 12))’ ), –Y
(‘POLYGON((4 11, 4 12, 5 12, 5 11.8, 4.25 11.8, 4.25 11.2, 5 11.2, 5 11, 4 11))’ ),–C
(‘POLYGON((5 11, 5 12, 5.2 12, 5.2 11.6, 5.8 11.6, 5.8 12, 6 12, 6 11, 5.8 11, 5.8 11.4, 5.2 11.4, 5.2 11, 5 11))’ ),–H
(‘POLYGON((6 11, 6 12, 7 12, 7 11.5, 6.4 11.5, 7 11, 6.7 11, 6.2 11.4, 6.2 11, 6 11),(6.2 11.8, 6.8 11.8, 6.8 11.7, 6.2 11.7, 6.2 11.8))’ ),–R
(‘POLYGON((7.2 11, 7.2 11.2, 7.4 11.2, 7.4 11.8, 7.2 11.8, 7.2 12, 7.8 12, 7.8 11.8, 7.6 11.8, 7.6 11.2, 7.8 11.2, 7.8 11, 7.2 11))’ ),–I
(‘POLYGON((8 11, 8 11.2, 8.8 11.2, 8.8 11.4, 8 11.4, 8 12, 9 12, 9 11.8, 8.2 11.8, 8.2 11.6, 9 11.6, 9 11, 8 11))’ ),–S
(‘POLYGON((9 11.8, 9 12, 10 12, 10 11.8, 9.6 11.8, 9.6 11, 9.4 11, 9.4 11.8, 9 11.8))’ ),–T
(‘POLYGON((10 11, 10 12, 10.25 12, 10.5 11.5, 10.75 12, 11 12, 11 11, 10.75 11, 10.75 11.7, 10.5 11.2, 10.25 11.7, 10.25 11, 10 11))’ ),–M
(‘POLYGON((11 11, 11 12, 12 12, 12 11, 11.75 11, 11.75 11.3, 11.25 11.3, 11.25 11, 11 11),(11.25 11.5, 11.25 11.8, 11.75 11.8, 11.75 11.5, 11.25 11.5))’ ),–A
(‘POLYGON((12 11, 12 11.2, 12.8 11.2, 12.8 11.4, 12 11.4, 12 12, 13 12, 13 11.8, 12.2 11.8, 12.2 11.6, 13 11.6, 13 11, 12 11))’ )–S
–Decorate the tree with some round bell circles
DECLARE @counter INT = 0
,@x INT
,@y INT ;
WHILE ( @counter < 25 )
BEGIN
INSERT INTO #xmasTREE
VALUES (GEOMETRY::Point(RAND() * 5 + 2.5, RAND() * 8.5, 0).STBuffer(0.3) )
SET @counter+=1 ;
END
Select * from #xmasTREE
Drop table #xmasTREE
Our next example comes from StackOverflow with a similar example for MySQL.
DECLARE @g TABLE (g GEOMETRY, ID INT IDENTITY(1,1));
-- Adjust Color
INSERT INTO @g(g) SELECT TOP 29 CAST('POLYGON((0 0, 0 0.0000001, 0.0000001 0.0000001, 0 0))' as geometry) FROM sys.messages;
-- Build Christmas Tree
INSERT INTO @g(g) VALUES (CAST('POLYGON((0 0,900 0,450 400, 0 0 ))' as geometry).STUnion(CAST('POLYGON((80 330,820 330,450 640,80 330 ))' as geometry)).STUnion(CAST('POLYGON((210 590,690 590,450 800, 210 590 ))' as geometry)));
-- Adjust Color
INSERT INTO @g(g) SELECT TOP 294 CAST('POLYGON((0 0, 0 0.0000001, 0.0000001 0.0000001, 0 0))' as geometry) FROM sys.messages;
-- Build a Star
INSERT INTO @g(g) VALUES (CAST('POLYGON ((450 910, 465.716 861.631, 516.574 861.631, 475.429 831.738, 491.145 783.369, 450 813.262, 408.855 783.369, 424.571 831.738, 383.426 861.631, 434.284 861.631, 450 910))' as geometry));
-- Build Colored Balls
INSERT INTO @g(g) SELECT TOP 2 CAST('POLYGON((0 0, 0 0.0000001, 0.0000001 0.0000001, 0 0))' as geometry) FROM sys.messages;
INSERT INTO @g(g) VALUES (CAST('CURVEPOLYGON (CIRCULARSTRING (80 290, 110 320, 140 290, 110 260, 80 290))' as geometry));
INSERT INTO @g(g) SELECT TOP 2 CAST('POLYGON((0 0, 0 0.0000001, 0.0000001 0.0000001, 0 0))' as geometry) FROM sys.messages;
INSERT INTO @g(g) VALUES (CAST('CURVEPOLYGON (CIRCULARSTRING (760 290, 790 320, 820 290, 790 260, 760 290))' as geometry));
INSERT INTO @g(g) SELECT TOP 3 CAST('POLYGON((0 0, 0 0.0000001, 0.0000001 0.0000001, 0 0))' as geometry) FROM sys.messages;
INSERT INTO @g(g) VALUES (CAST('CURVEPOLYGON (CIRCULARSTRING (210 550, 240 580, 270 550, 240 520, 210 550))' as geometry));
INSERT INTO @g(g) SELECT TOP 46 CAST('POLYGON((0 0, 0 0.0000001, 0.0000001 0.0000001, 0 0))' as geometry) FROM sys.messages;
INSERT INTO @g(g) VALUES (CAST('CURVEPOLYGON (CIRCULARSTRING (630 550, 660 580, 690 550, 660 520, 630 550))' as geometry));
SELECT g FROM @g ORDER BY ID;
GO
Connor McDonold posted the following SQL to create a Christmas Tree on StackOverflow in 2020, and wrote a blog post for it in December 2021. I just made one very very minor change to it.
You need to be careful where you run this. It runs best on/in a Linux environment, docker, VM, etc using SQL Command Line or SQL*Plus. For me, SQL Developer struggled to present the results correctly.
select replace(replace(replace(r,'X',chr(27)||'[42m'||chr(27)||'[1;'||to_char(32)||'m'||'X'||chr(27)||'[0m'),
'T',chr(27)||'[43m'||chr(27)||'[1;'||to_char(33)||'m'||'T'||chr(27)||'[0m'),
'@',chr(27)||'[33m'||chr(27)||'[1;'||to_char(31)||'m'||'@'||chr(27)||'[0m') Happy_Christmas
from ( select lpad(' ',20-e-i)|| case when dbms_random.value < 0.3 then substr(s,1,e*2-3+i*2)
else substr(substr(s,1,dbms_random.value(1,e*2-3+i*2-1))||'@'||s,1,e*2-3+i*2) end r
from ( select rpad('X',40,'X') s,rpad('T',40,'T') t from dual ) ,
( select level i, level+2 hop from dual connect by level <= 4 ) , lateral
( select level e from dual connect by level <= hop ) union all select lpad(' ',17)||substr(t,1,3)
from ( select rpad('X',40,'X') s,rpad('T',40,'T') t from dual ) connect by level <= 5 );
Next up we have a simpler Christmas Tree. This comes from Matheus Boesing and his original post on grepora.
clear screen
set feedback off;
set heading off;
set pages 80;
SELECT DECODE(SIGN(FLOOR(maxwidth / 2) - ROWNUM),
1,
LPAD(' ', FLOOR(maxwidth / 2) - (ROWNUM - 1)) ||
RPAD('*', 2 * (ROWNUM - 1) + 1, ' *'),
LPAD('* * *', FLOOR(maxwidth / 2) + 3))
FROM all_objects, (SELECT 40 AS maxwidth FROM DUAL)
WHERE ROWNUM < FLOOR(maxwidth / 2) + 5
union all select ' Happy Christmas from Brendan!' from dual;
set heading on;
set feedback on;
This next example comes from LearnSQL and is similar to the previous example, but this time we get a multiple trees.
clear screen
set feedback off;
set heading off;
set pages 80;
WITH small_tree(tree_depth,pine) AS (
SELECT 1 tree_depth,
rpad(' ',10,' ') || '*'
|| rpad(' ',20,' ') || '*'
|| rpad(' ',20,' ') || '*'
pine
FROM dual
UNION ALL
SELECT small_tree.tree_depth +1 tree_depth,
rpad(' ',10-small_tree.tree_depth,' ') || rpad('*',small_tree.tree_depth+1,'.') || lpad('*',small_tree.tree_depth,'.')
|| rpad(' ',20-small_tree.tree_depth-tree_depth,' ') || rpad('*',small_tree.tree_depth+1,'.') || lpad('*',small_tree.tree_depth,'.')
|| rpad(' ',20-small_tree.tree_depth-tree_depth,' ') || rpad('*',small_tree.tree_depth+1,'.') || lpad('*',small_tree.tree_depth,'.') pine
FROM small_tree
where small_tree.tree_depth < 10
)
SELECT rpad(' ',9,' ') ||'Ho'
|| rpad(' ',19,' ') || 'Ho'
|| rpad(' ',19,' ') || 'Ho'
pine
FROM dual
UNION ALL
SELECT pine
FROM small_tree;
set heading on;
set feedback on;
Hans Viehmann from the Oracle Spatial teams sent me this example using Oracle Spatial and Oracle Spatial Studio. The geospatial data is defined using GeoJSON. The funny coordinates are referencing the Santa Claus village near Rovaniemi in Finnish Lappland, right on the Arctic Circle. Oracle Spatial Studio can be used to view the Christmas tree on a map (see image below).
DROP TABLE XMAS_TREE_JSON;
DROP TABLE XMAS_TREE;
CREATE TABLE XMAS_TREE_JSON (
ID NUMBER(10),
DATA CLOB,
CONSTRAINT XMAS_TREE_PK PRIMARY KEY ( ID ),
CONSTRAINT XMAS_TREE_JSON_CHK CHECK ( DATA IS JSON )
);
INSERT INTO XMAS_TREE_JSON VALUES (
1,
'{
"type": "Feature",
"properties": { "label": "Tree"},
"geometry": {
"type": "Polygon",
"coordinates": [
[[25.84725335240364,
66.5437744044363],
[25.847166180610653,
66.543721555766],
[25.847235918045044,
66.5437231572425],
[25.84712728857994,
66.5436740452493],
[25.84722116589546,
66.54367564672889],
[25.847095102071762,
66.54362012871027],
[25.847205072641373,
66.54362226402098],
[25.847202390432358,
66.54361105363778],
[25.847297608852386,
66.54361212129352],
[25.847297608852386,
66.5436238655039],
[25.84740623831749,
66.5436243993315],
[25.84728017449379,
66.54367724820834],
[25.84736466407776,
66.54367724820834],
[25.847273468971252,
66.54372369106797],
[25.847321748733517,
66.54372369106797],
[25.84725335240364,
66.5437744044363]
]
]
}
}'
);
COMMIT;
CREATE TABLE XMAS_TREE
AS
SELECT
ID,
JSON_VALUE(DATA, '$.geometry' RETURNING SDO_GEOMETRY) AS SHAPE,
JSON_VALUE(DATA, '$.properties.label') AS LABEL
FROM
XMAS_TREE_JSON;
Happy Christmas everyone.
Ora-lytics 