group by count(last_name), first_name, phone_number * ERROR at line 3: ORA-00934: group function is not allowed here SQL> 分析: 对于任何group功能, COUNT不能用在GROUP BY条件中。你只可以列出字段和非group功能,例如在GROUP BY 中使用SUBSTR条件。 提示: COUNT是一个作用于查询中的group上的功能。
4 GROUP BY dept_id; WHERE AVG(salary) > 2000 * ERROR at line 3: ORA-00934: group function is not allowed here 应在GROUP BY 后面加上HAVING AVG(salary) > 2000; 因为是用来限制组的返回。 多级分组实例: SQL> SELECT dept_id, title, COUNT(*) 2 FROM s_emp 3 GROUP BY dept_id, title...
ORA-00934: group function is not allowed here 运行之后会发现给出的错误提示:WHERE子句上不允许使用分组函数,之所以不能够使用是因为统计的操作属于GROUP BY之后的范畴了,而 WHERE是在GROUP BY操作之前使用的,所以此时如果要想针对分组后的数据进行过滤,那么只能够使用HAVING子句,正确的sql写法如下: SELECT job,AVG...
SELECT CUST_NBR, COUNT(ORDER_NBR)FROM CUST_ORDERGROUP BY CUST_NBR, COUNT(ORDER_NBR);GROUP BY CUST_NBR, COUNT(ORDER_NBR) * ERROR at line 3: ORA-00934: group function is not allowed here If we have a constant in our SELECT list, we don’t need to include it in the GROUP BY clau...
ORA-00934: group function is not allowed here Constants can be omitted from the GROUP BY clause If you have a constant in your SELECT list, you don’t need to include it in the GROUP BY clause. However, including theconstant in the GROUP BY clause doesn’t alter the result. Therefore,...
READONLY is required for user-defined table type parameters (TVPs), and can't be used for any other parameter type. return_data_type The return value of a scalar user-defined function. For Transact-SQL functions, all data types, including CLR user-defined types, are allowed except the ...
It is not allowed because the metadata is not versioned. A concurrent update to metadata could lead to inconsistency if mixed with snapshot isolation. 下表顯示不同隔離等級所啟用的並行副作用。 展開資料表 隔離等級中途讀取 (Dirty read)非可重複讀取虛設項目 (Phantom) REA...
ALTERAVAILABILITYGROUP[<name>]SET(REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT = <integer>); ROLE The only valid parameter is 'SECONDARY', and this SET option is only valid in Distributed Availability Groups. It's used to fail over a distributed availability group as documented here:ALTER AVAILABILI...
DELTA_GEOSPATIAL_NOT_SUPPORTED、DELTA_INCORRECT_LOG_STORE_IMPLEMENTATION、DELTA_MISSING_PROVIDER_FOR_CONVERT、DELTA_MODE_NOT_SUPPORTED、DELTA_NESTED_NOT_NULL_CONSTRAINT、DELTA_NON_DETERMINISTIC_FUNCTION_NOT_SUPPORTED、DELTA_OPERATION_NOT_ALLOWED、DELTA_OPERATION_NOT_ALLOWED_DETAIL、DELTA_OPERATION_NOT_SUPPORTED...
A computed column can be used as a key column in an index or as part of any PRIMARY KEY or UNIQUE constraint, if the computed column value is defined by a deterministic expression and the data type of the result is allowed in index columns. For example, if the table has integer columns...