OPTIONS (skip=1,rows=128)--sqlldr 命令显示的选项可以写到这里边来,skip=1 用来跳过数据中的第一行LOADDATA INFILE*--因为数据同控制文件在一起,所以用 * 表示append--这里用了 append 来操作,在表 users 中附加记录INTOTABLEuserswhenLOGIN_TIMES<>'8'--还可以用 when 子句选择导入符合条件的记录Fields te...
On occasion it is necessary to aggregate data from a number of rows into a single row, giving a list of data associated with a specific value. Using the SCOTT.EMP table as an example, we might want to retrieve a list of employees for each department. Below is a list of the base data...
3 rows selected. 使用Ref Cursor实现通用函数 另一个可替代的方法是使用游标变量写一个函数来连接行值。基本和上面一样,只是传入的是一个游标,所以使得它更通用:. CREATE OR REPLACE FUNCTION concatenate_list (p_cursor IN SYS_REFCURSOR) RETURN VARCHAR2 IS l_return VARCHAR2(32767); l_temp VARCHAR2(327...
CREATE OR REPLACE TYPE t_varchar2_tab AS TABLE OF VARCHAR2(4000); / CREATE OR REPLACE FUNCTION tab_to_string (p_varchar2_tab IN t_varchar2_tab, p_delimiter IN VARCHAR2 DEFAULT ',') RETURN VARCHAR2 IS l_string VARCHAR2(32767); BEGIN FOR i IN p_varchar2_tab.FIRST .. p_varchar2...
In Oracle you can use LISTAGG function to concatenate strings from multiple rows into a single row value. In SQL Server you can use STRING_AGG function but note that it is available since SQL Server 2017 only. Consider a sample table: CREATE TABLE
3 rows selected. 使用Ref Cursor实现通用函数 另一个可替代的方法是使用游标变量写一个函数来连接行值。基本和上面一样,只是传入的是一个游标,所以使得它更通用:. CREATE OR REPLACE FUNCTION concatenate_list (p_cursor IN SYS_REFCURSOR) RETURN VARCHAR2 ...
When dealing with grouped data, we may need to concatenate the details of individual rows for each group. The GROUP_CONCAT function simplifies this task and provides a consolidated string for better data presentation. 3.3 Simplifying SQL Joins: By utilizing GROUP_CONCAT, we can avoid complex SQL...
3 rows selected. 使用Ref Cursor实现通用函数 另一个可替代的方法是使用游标变量写一个函数来连接行值。基本和上面一样,只是传入的是一个游标,所以使得它更通用:. CREATE OR REPLACE FUNCTION concatenate_list (p_cursor IN SYS_REFCURSOR) RETURN VARCHAR2 IS l_return VARCHAR2(32767); l_temp ...
the function will group all data set based on the unique cities by using the group by clause. Now the function will concatenate all the names present in each group into a single row with each element present in the single row separated by a comma (default). If we provide DISTINCT function...
SQL> insert into loadtest select * from all_objects; 30363 rows created. SQL> select count(*) from loadtest; COUNT(*) --- 30363 #在提交前就可以查询。 SQL> commit; Commit complete. 串行直接加载: SQL> insert /*+ append */ into loadtest 2 nologging...