How to print out different triangle shapes using SQL? (example)

Let us see how to print various types of triangle shapes using SQL. (Related recommendations: "MySQL Tutorial" "SQL Tutorial")

Grammar:

Declare @variable_name DATATYPE     -- 首先用数据类型(int)声明所有变量
                                   
select @variable = WITH_ANY_VALUE   -- 选择变量并用值初始化

while CONDITION                     -- 例如@variable > 0

begin                               -- 开始

print replicate('*', @variable)     -- 在变量times中复制插入*字符

set increment/decrement             -- 递增/递减
                                    -- @variable= @variable+1
END                                 -- while循环结束

One:

DECLARE @var int               -- 声明
SELECT @var = 5                -- 初始化
WHILE @var > 0                 -- 条件
BEGIN                          -- 开始
PRINT replicate('* ', @var)    -- 打印
SET @var = @var - 1            -- 递减
END                            -- END

Output:

* * * * *
* * * * 
* * * 
* * 
*

The second type:

DECLARE @var int                  -- 声明
SELECT @var = 1                   -- 初始化
WHILE @var <= 5                   -- 条件
BEGIN                             -- 开始
PRINT replicate(&#39;* &#39;, @var)       -- Print 
SET @var = @var + 1               -- Set 
END                               -- end

Output:

*
* *
* * *
* * * *
* * * * *

Third type:

DECLARE @var int, @x int                 -- 声明两个变量
SELECT @var = 4,@x = 1                   -- 初始化
WHILE @x <=5                             -- 条件
BEGIN
PRINT space(@var) + replicate(&#39;*&#39;, @x)   -- here space for  
                                         -- create spaces  
SET @var = @var - 1                      -- set 
set @x = @x + 1                          -- set 
END                                      -- End

Output:

    *
   **
  ***
 ****
*****

Fourth type:

DECLARE @var int, @x int                 -- 声明两个变量
SELECT @var = 0,@x = 5                   -- 初始化
WHILE @x > 0                             -- 条件
BEGIN
PRINT space(@var) + replicate('*', @x)   -- here space for 
                                         -- create spaces  
SET @var = @var + 1                      -- set 
set @x = @x - 1                          -- set 
END                                      -- End

Output:

*****
 ****
  ***
   **
    *

This article is about using SQL to print out different triangles. It is simple and interesting. I hope it will be helpful to friends in need!

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