protected void ddl_area_SelectedIndexChanged(object sender, EventArgs e) { conn = new SqlConnection(ConfigurationManager.ConnectionStrings[“strcon”].ConnectionString); this.ddl_city.Enabled = true; string str1=”0000″; cmd = new SqlCommand(“select AreaID,Name from Area where substring(AreaID,1...
Introducing Substring in SQL Substring is commonly defined as a function that is utilized to return a segment of a string. Different databases follow different means of doing so. For instance, in ORACLE, the function is SUBSTR(), in MYSQL, it is SUBSTR(), SUBSTRING(), and in the SQL ser...
Select*from学生表whereleft(姓名,1)=’杨’orleft(姓名,1)=’张’orleft(姓名,1)=’李’Select*from学生表whereleft(姓名,1)in(’杨’,’张’,’李’)Select*from学生表whereleft(姓名,1)like'[杨张李]'Select*from学生表where姓名like'[杨张李]%'Select*from学生表wheresubstring(姓名,1,1)like'[杨...
一、SUBSTRING函数的基本语法 SUBSTRING函数在pgsql中有多种语法形式,主要包括: 三个参数形式: SUBSTRING(string,start_position,length) 1. string:待截取的字符串,可以是char、varchar、text等数据类型。 start_position:开始截取的位置,整数类型,从1开始计数。如果为0,则从第一个字符开始(但pgsql中通常为1开始)。
SELECTSUBSTR(Name, 1,POSITION(““INName))ASFirstNameFROMEmployee; 代码语言: SQL(结构化查询语言) (sql ) 我们的输出是: 结论 SUBSTRING()并且SUBSTR()是 MySQL 中使用最广泛的字符串函数之一。我建议你和他们一起玩并练习。 参考 MySQL 官方SUBSTRING()文档和SUBSTR()....
GO-- Create npub_info table in pubs database. Borrowed from instpubs.sql.USE pubs GOCREATETABLEnpub_info ( pub_idchar(4)NOTNULLREFERENCESpublishers(pub_id)CONSTRAINTUPKCL_npubinfoPRIMARYKEY CLUSTERED, pr_info ntextNULL) GO-- Fill the pr_info column in npub_info with international data....
sql 语句 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECTYEAR,SUBSTRING_INDEX(GROUP_CONCAT(amount),",",1)ASm1,SUBSTRING_INDEX(SUBSTRING_INDEX(GROUP_CONCAT(amount),",",2),",",-1)ASm2,SUBSTRING_INDEX(SUBSTRING_INDEX(GROUP_CONCAT(amount),",",-2),",",1)ASm3,SUBSTRING_INDEX(GROU...
SQL IF EXISTS (SELECTtable_nameFROMINFORMATION_SCHEMA.TABLESWHEREtable_name ='npub_info')DROPTABLEnpub_info; GO-- Create npub_info table in pubs database. Borrowed from instpubs.sql.USEpubs; GOCREATETABLEnpub_info ( pub_idCHAR(4)NOTNULLFOREIGNKEYREFERENCESpublishers (pub_id)CONSTRAINTUPKCL_...
function SubstringDemo(){var ss; //Declare variables.var s = "The rain in Spain falls mainly in the plain..";ss = s.substring(12, 17); //Get substring.return(ss); //Return substring.}public String substring(int beginIndex,int endIndex)返回一个新字符串，它是此字符串的一个...
以下是上述两类语句的SQL标准版本写法,意义相同,它更长,但更具表现力。 SUBSTRING(stringFROMposition);SUBSTRING(stringFROMpositionFORlength); 下面让我们来一起看一下SUBSTRING()的两种用法示例; 1.SUBSTRING(string,position) string:参数是要操作的字符串。