SQL 複製 SELECT name, SUBSTRING(name, 1, 1) AS Initial, SUBSTRING(name, 3, 2) AS ThirdAndFourthCharacters FROM sys.databases WHERE database_id < 5; 結果集如下所示。 展開資料表 NAMEInitialThirdAndFourthCharacters master
select substring(str,start,length); sql的第一位置可以是0,也可以是1,如果start+length大于了str的length,则返回从头开始,整个str stuff(str,start,del_len,rep_str) select stuff('abc',2,1,'xyz'); ==>axyzc
T-SQL substring is the function that acknowledges the user to extract a substring from the provided string as per the user’s requirement so it can derive the string which has a defined length that can begin from the provided location. The main motive of the Substring() function is to give...
In my previous article about T-SQL regular expressions, I have explained the LIKE operator, its usage and provided several examples with it. In this article, we are going to discuss the SUBSTRING, PATINDEX, and CHARINDEX functions of T-SQL. These functions can be used to perform pattern ...
SQL SELECTname,SUBSTRING(name,1,1)ASInitial,SUBSTRING(name,3,2)ASThirdAndFourthCharactersFROMsys.databasesWHEREdatabase_id <5; 结果集如下。 name初始ThirdAndFourthCharacters mastermst tempdbtmp modelmde msdbmdb 若要显示字符串常量abcdef的第二、第三和第四个字符,请使用以下查询。
private void DDL_AreaBind() { conn = new SqlConnection(ConfigurationManager.ConnectionStrings[“strcon”].ConnectionString); string str = “0000”; cmd = new SqlCommand(“select AreaID,Name=ltrim(Name) from Area where right(AreaID,4) ='” + str + “‘”, conn); SqlDataAdapter sda = new...
CREATE TABLE test_substr (value VARCHAR2(200));接着，我们向这个表中插入一些测试数据：'1245abs''abcdefg''1又课批果家23456''89765321307'通过执行SQL查询，我们想要获取表中的所有记录，并从每个字符串的右侧倒数第三个字符开始截取。这可以通过以下SQL语句实现：SELECT t.*, SUBSTR(value, -3)...
接下来，我们编写一个新的SQL查询，从每个字符串的倒数第三个字符开始取数。具体SQL语句如下：SELECT t.*, SUBSTR(value, -3) value2 FROM test_substr t;这个查询使用了SUBSTR函数，它可以从字符串中提取子字符串。在我们的例子中，-3表示从字符串的最后一个字符开始，向左数三个字符。例如，对于...
SQL Copiar SELECT name, SUBSTRING(name, 1, 1) AS Initial , SUBSTRING(name, 3, 2) AS ThirdAndFourthCharacters FROM sys.databases WHERE database_id < 5; El conjunto de resultados es el siguiente:Expandir tabla nameInitialThirdAndFourthCharacters maestro m st tempdb t mp model m de msdb...
tempdb t mp model m de msdb m dbHere is how to display the second, third, and fourth characters of the string constant abcdef.SQL კოპირება SELECT x = SUBSTRING('abcdef', 2, 3); Here is the result set.კოპირება ...