Generate pattern using SQL
I have a table with a single column with numbers 1-100. Want to generate an output where each number
N is repeated
N times (so
5 should appear 5 times):
1 2 2 3 3 3 4 4 4 4 and so on
mysql versions prior to
create table _set(n int); insert into _set(n) values (1), (2), (3), (4), (5), (6); -- this goes on select s2.* from _set as s join _set as s2 on s.n <= s2.n;
Temporary tables can't be opened twice documented issue.
8.0, try this,
with _set as (select 1 as n union all select n+1 as n from _set where n < 100 ) select s2.* from _set s join _set s2 on s.n <= s2.n
Row Pattern Recognition in SQL - SQLPerformance.com, Ticker, with columns symbol, tradedate and price. Use the following code to create the table, populate it with some sample data, and query it: SET� Declare @variable_name DATATYPE -- first declare all the -- variables with datatype -- like (int) select @variable = WITH_ANY_VALUE -- select the variable and -- initialize with value while CONDITION -- condition like @variable > 0 begin -- begin print replicate ('*', @variable) -- replicate insert the * -- character in variable times set increment/decrement -- in increment/decrement -- @variable= @variable+1 END -- end while loop
If you have a table with numbers, then use it in a self join:
select n.n from numbers n join numbers n2 on n2.n <= n.n order by n.n;
Here is a db<>fiddle example.
How do I print a triangle of stars using SQL, Is it practically possible to create a triangle of stars like this as below in SQL.I know that this could be done easily in any other programming language like C,C ++� I would like to generate the data by given regex pattern in SQL Server. Is there any possibility to do? Say, I have pattern as below and I would like to generate data as follow: The idea behind the concept is SQL STATIC DATA MASKING (which was removed in current feature). Our client wants to mask the production data in test database.
For MySql 5.x
Create a tally table with positive numbers, including 0.
Then self-join that number table.
select n1.n as num from nums as n1 join nums as n2 on n2.n < n1.n where n1.n between 1 and 100 order by n1.n;
An example of creating such a number table:
CREATE TABLE digits (n int primary key not null); insert into digits (n) values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); CREATE TABLE nums (n int primary key not null); -- fill with numbers 0 to 999 INSERT INTO nums (n) SELECT (d3.n*100 + d2.n*10 + d1.n) as num FROM digits d1 CROSS JOIN digits d2 CROSS JOIN digits d3;
In MySql 8 a recursive CTE can be used instead
WITH RECURSIVE NUMS AS ( SELECT 0 as n UNION ALL SELECT n+1 FROM NUMS WHERE n < 100 ) SELECT n1.n FROM NUMS n1 JOIN NUMS n2 ON n2.n < n1.n ORDER BY n1.n;
Print Pattern Examples Using Sql – Query Examples, Replicate in Sql Right Triangle in Sql Triangle Program in Sql � Print Twisted Word Example In Sql � Create Function Like Replicate Not Using Replicate In Sql � Here is the script to Get a perfect triangle or Pyramid in sql (tested in Microsoft Sql 2008) declare @x int,@y int select @x=5,@y=0 while @x>0 begin print space(@x)+replicate('*',@y)+replicate('*',@y+1) set @y=@y+1 set @x=@x-1 end * *** ***** ******* ********* you can get many more scripts and help at this link it was helpful to me
SQL for Pattern Matching, Using ONE ROW PER MATCH , as shown in the first example, pattern matching generates one row for each match that is found. If you use ALL ROWS PER� Below I show how you can do this easily in SQL alone (no need for PL/SQL), and I show how to generate strings. If you do, in fact, need numbers, it's even easier. You need to generate 100 million rows. It's easiest to generate 10,000 rows, and then use a cartesian product.
Pattern Matching in SQL Queries with Wildcards, SQL pattern matching allows you to find data that fits a certain pattern, using the LIKE operator in a WHERE clause. Applies to: SQL Server 2017 (14.x) and later Azure SQL Database. This sample provides a Transact-SQL script to create a graph database with nodes and edges and then use the new MATCH clause to match some patterns and traverse through the graph. This sample script will work on both Azure SQL Database and SQL Server 2017 (14.x) Sample Schema
Useful SQL Patterns: Pivoting, The concept of the pivot in SQL refers to taking the data in table rows and making that data into columns. It's one of the most useful SQL� 36 thoughts on “ PL/SQL Program to Print Patterns ” varma December 17, 2017. Hi, I need oracle query for the given pattern. 1 12 123 1234. Reply
- Which MySQL version?
- I recommend using some sort of scripting language to manage this
- @jarlh any version will be fine!
- @jarlh is probably asking because, depending from the mysql version some features can or cannot be available
- MySQL 5.7 is probably too old for recursive cte's. (Version 8 needed?)