Oracle String concatenation The || operator does a String concatenation in Oracle. You can use this in both SQL and pl/sql. For example: select kol1||kol2 from tablename; select kol1||' - '||kol2 from tablename; declare l_var varchar2(2000); begin l_var := 'abc'||'def'; end...
在Oracle数据库中,可以使用WM_CONCAT函数实现字符串拼接。但是需要注意的是,WM_CONCAT函数已经被标记为过时,并建议使用LISTAGG函数代替。 以下是使用WM_CONCAT和LISTAGG函数进行字符串拼接的示例: 使用WM_CONCAT函数: SELECT WM_CONCAT(column_name) AS concatenated_string FROM table_name WHERE condition; 复制代码 ...
LISTAGG是Oracle官方推荐的替代WM_CONCAT的函数,用于实现字符串的聚合。以下是一个使用LISTAGG的示例: sql SELECT LISTAGG(column_name, ',') WITHIN GROUP (ORDER BY column_name) AS concatenated_string FROM table_name; 其中,column_name是你想要聚合的列名,table_name是你的表名。这个查询会将column_name列...
使用USE_CONCAT提示 --Use USE_CONCAT hints in Oracle Last Updated: Thursday, 2004-11-18 21:48 Eygle USE_CONCAT...使用USE_CONCAT提示示例: 1.使用scott用户及标准表进行测试 $ sqlplus scott/tiger SQL*Plus: Release 9.2.0.4.0 - Production...Card=2 Bytes=74) 1 0 TABLE ACCESS (FULL) OF '...
在Oracle中,您可以使用用户自定义聚合函数(User-Defined Aggregate Functions,UDAF)来实现类似于WM_CONCAT的功能 创建一个聚合类型: CREATE OR REPLACE TYPE my_wm_concat_type AS OBJECT ( concatenated_string VARCHAR2(32767), STATIC FUNCTION ODCIAggregateInitialize(sctx IN OUT my_wm_concat_type) RETURN ...
ctx2INwm_concat_impl)returnnumber ); / createorreplacetype body wm_concat_implis staticfunctionODCIAggregateInitialize(sctxINOUTwm_concat_impl) returnnumberis begin sctx := wm_concat_impl(null); dbms_lob.createtemporary(sctx.join_string,true); ...
在Oracle 中,以下用法用于将多个行值拼接为一个字符串: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 XMLAGG(XMLPARSE(CONTENT T.COLUMN_NAME || ',') ORDER BY T.COLUMN_ID).GETCLOBVAL() 但在迁移至 YashanDB(例如 22.2.3.1 版本)时,该写法会报错,因为: YashanDB 暂不支持XMLAGG、XMLPARSE、GET...
CONCATreturnschar1 concatenatedwithchar2. Both char1andchar2 can beanyofthe datatypesCHAR,VARCHAR2,NCHAR, NVARCHAR2, CLOB,orNCLOB. The string returnedisinthe samecharactersetaschar1. Its datatype dependsonthe datatypesofthe arguments.Inconcatenationsoftwo different datatypes, OracleDatabasereturnsthe da...
The data type of the result string depends on the data types of the two arguments. Oracle will try to convert the result string in a loss-less manner. For example, if you concatenate a CLOB value with an NCLOB value, the data type of the returned string will be NCLOB. ...
CONCATreturnschar1 concatenatedwithchar2. Both char1andchar2 can beanyofthe datatypesCHAR,VARCHAR2,NCHAR, NVARCHAR2, CLOB,orNCLOB. The string returnedisinthe samecharactersetaschar1. Its datatype dependsonthe datatypesofthe arguments.Inconcatenationsoftwo different datatypes, OracleDatabasereturnsthe da...