使用CONCAT() 函数: SELECT CONCAT(column1, column2) AS concatenated_string FROM table_name; 这里,column1 和 column2 是需要拼接的列。concatenated_string 是拼接后的新列的别名。 例如,假设有一个 users 表,包含 first_name 和 last_name 两列,可以使用以下查询将这两列拼接在一起: SELECT CONCAT(f...
在SQL 中,CONCATENATE 和加号(+)都可以用于将两个字符串连接在一起 语法: CONCATENATE 函数:CONCATENATE(string1, string2) 加号(+):string1 + string2 支持的数据库: CONCATENATE 函数主要在 Microsoft Access 和 SQL Server 中使用。 加号(+)主要在 MySQL、PostgreSQL、SQLite 和其他一些数据库中使用。 处理空...
The CONCAT function is used to combine or concatenate two or more string values. The SQL CONCAT function takes at least two arguments that are converted to strings (if they are not already) and returns a concatenated string. For example: CONCAT ( ‘String 1 ‘, ‘String 2 ‘, ‘String 3...
The following example uses the CONVERT function to concatenate numeric and date data types.SQL Copy -- Uses AdventureWorks SELECT 'The order is due on ' + CONVERT(VARCHAR(12), DueDate, 101) FROM Sales.SalesOrderHeader WHERE SalesOrderID = 50001; GO ...
使用CONCAT函数和concatenate运算符显示两次连接: SELECT {fn CONCAT(Home_State,Home_City)} AS LocationFunc, Home_State||Home_City AS LocationOp FROM Sample.Person 以下示例显示尝试连接字符串和空值时发生的情况: SELECT {fn CONCAT(Home_State,NULL)} AS StrNull FROM Sample.Person 下面的示例显示数字在...
1SELECT CONCAT (String_Value1, String_Value2, String_Value3 [, String_ValueN]) Let’s look at an example using Concat string function: In this example, we will use three strings stored in different variables and then concatenate the strings using Concat function. ...
该问题可参考: - 【stackoverflow】Can I concatenate multiple MySQL rows into one field? 相关资料: 【stackoverflow】SQL split values to multiple rows 【stackoverflow】Can I concatenate multiple MySQL rows into one field? 【stackoverflow】How to split the name string in mysql? 【mysql参考手册】mys...
(self IN OUT t_clob_agg, value IN clob) RETURN NUMBER IS BEGIN -- Concatenate string only when not already existing in the list (=unique) SELF.g_string := self.g_string || ',' || value; RETURN ODCIConst.Success; END; MEMBER FUNCTION ODCIAggregateTerminate(self IN t_clob_agg, ...
以下示例连接Home_State和Home_City列以创建位置值。使用CONCAT函数和concatenate运算符显示两次连接: SELECT {fn CONCAT(Home_State,Home_City)} AS LocationFunc, Home_State||Home_City AS LocationOp ...
The following example uses the CONVERT function to concatenate numeric and date data types.Copy USE AdventureWorks; GO SELECT 'The order is due on ' + CONVERT(varchar(12), DueDate, 101) FROM Sales.SalesOrderHeader WHERE SalesOrderID = 50001; GO ...