altertabledept addconstraintdept_pk primarykey(deptno); 方法1.emp中的每一行都会进行max比较,费时 select*fromemp emp1whereemp1.sal=(selectmax(emp2.sal)fromemp emp2whereemp2.deptno=emp1.deptno) 方法2.先子查询查找出max sal,然后与emp表相关联,如果逻辑复杂会产生较多代码 select*fromemp emp1,(se...
SELECT MAX(ord_amount): This is the main part of the SQL query. It uses the MAX() function to calculate the maximum value of the 'ord_amount' column in the 'orders' table. The result will be a single value representing the maximum value found in the 'ord_amount' column. FROM orders...
Argument data type datetime is invalid for argument 3 of json_modify function Argument data type sql_variant is invalid for argument 1 of like function Argument data type text is invalid for argument 29 of checksum function Argument data type varchar is invalid for argument 1 of formatmessage fun...
1. select max(aaa),bbb,ccc from x group by bbb,ccc 这个语法是找出bbb, ccc在相同的情况下，aaa的最大值。2. select max(aaa),max(bbb),ccc from x group by ccc 这个语法是找出ccc相同时的aaa的最大值和bbb的最大值。举例 aaa bbb ccc 5 4 4 6 4 4 5 6...
MAX_BY函数是一种用于在给定的一组值中找到最大值,并返回与该最大值相关联的其他列值的函数。在Oracle SQL中,没有直接的MAX_BY函数,但可以使用其他方法来实现类似的功能。 一种实现MA...
Oracle10gR2 (10.2.0.2 or higher) Workarounds: setting initialisation parameter BLANK_TRIMMING=TRUE declare PL/SQL CHAR and VARCHAR2 variable used in the INTO clause of SELECT statement as 4,000 bytes. Use CAST SQL function to constraint the size to that of the variable size like ...
问将MAX_BY函数转换为Oracle SQLEN版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本...
```conf max_stack_depth = 2MB ```也可以在会话中临时设置：```sql SET max_stack_depth = '...
You can use it as an aggregate or analytic function. See Also: "About SQL Expressions" for information on valid forms of expr, "Floating-Point Numbers" for information on binary-float comparison semantics, and "Aggregate Functions" Appendix C in Oracle Database Globalization Support Guide for ...
SQL> f_max(),模拟MAX()函数: 定义TYPE: CREATE OR REPLACE TYPE f_max_type AS OBJECT ( var NUMBER, STATIC FUNCTION ODCIAggregateInitialize(sctx IN OUT f_max_type) RETURN NUMBER, MEMBER FUNCTION ODCIAggregateIterate(SELF IN OUT f_max_type, VALUE IN NUMBER) RETURN NUMBER, ...