The Oracle/PLSQL MAX function returns the maximum value of an expression. Syntax The syntax for the MAX function in Oracle/PLSQL is: SELECT MAX(aggregate_expression) FROM tables [WHERE conditions]; OR the syntax for the MAX function when grouping the results by one or more columns is: SELE...
create or replace function get_num(CONS_ID in number) return varchar2 is v_cons_no varchar2(20); begin select max(cons_no) into v_cons_no from c_cons where cons_id = CONS_ID; return v_cons_no; end get_num; / 其中cons_id为number(16) 是表c_cons的主键 cons_no为varchar2(16) ...
ORA-06502: PL/SQL:数字或值错误:字符串缓冲区太小 这个时候有3个方法可以解决 1、setting initialisation parameter BLANK_TRIMMING=TRUE 2、declare PL/SQL CHAR and VARCHAR2 variable used in the INTO clause of SELECT statement as 4,000 bytes. 3、Use CASTSQLfunction to constraint the size to that ...
当然也可以把开启初始化放在别的地方。 /* USART3 init function */ void MX_USART3_UART_Init(void) { /* USER CODE BEGIN USART3_Init 0 */ /* USER CODE END USART3_Init 0 */ /* USER CODE BEGIN USART3_Init 1 */ /* USER CODE END USART3_Init 1 */ huart3.Instance = USART3; h...