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                ## while 循環 語法 : ~~~ while 條件 do 要循環執行的代碼; end while; ~~~ #### 結構標識符 結構標識符:為某些特定的結構進行命名,然后為的是在某些地方使用名字. 語法: ~~~ 標識名字:while 條件 do 循環體 end while [標識名字]; ~~~ 標識符的存在主要是為了循環體中使用循環控制。在mysql中沒有continue和break,有自己的關鍵字替代: 1. iterate:迭代,就是以下的代碼不執行,重新開始循環(continue). 2. leave:離開,整個循環終止(break). 語法: ~~~ 標識名字:While 條件 do If 條件判斷 then 循環控制; Iterate/leave 標識名字; End if; 循環體 End while [標識名字]; ~~~
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