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MySQL字符串函数
2022-07-06 09:30:00 【My71】
转 ASCII 码
函数:ASCII(字符串)
指令
SELECT ASCII("A") AS ASCII码;
运行结果
统计字符串长度
函数:CHAR_LENGTH(字符串)
指令
SELECT CHAR_LENGTH("abcde") AS 字符串长度;
运行结果
合并字符串
函数:CONCAT(s1,s2…sn)
指令
SELECT CONCAT("My","SQL") AS 合并字符串;
运行结果
返回字符串的位置
函数:FIELD(s,s1,s2…)
说明:返回值为字符串 s 在 s1,s2… 列表中的位置,起始位置为 1
指令
SELECT FIELD("a","b","c","a","d") AS 查找字符a;
运行结果
字符转小写
函数:LCASE(字符串)
指令
SELECT LCASE("aBcDeF") AS 转小写;
运行结果
字符转大写
函数:UCASE(字符串)
指令
SELECT UCASE("aBcDeF") AS 转大写;
运行结果
取出前 n 个字符
函数:LEFT(字符串,位置)
指令
SELECT LEFT("aBcDeF",3) AS 取出字符;
运行结果
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