when m.s_value is null then '0' else to_char(to_date(s_value, 'yyyy-MM-dd hh24:mi:ss'), 'yyyy-MM-dd hh24:mi:ss') end) into cf from jhcdr_emr_data_element m where m.de_code = 'CFJZQJSSJ' and m.file_unique_id = item.file_unique_id and m.s_value <> ' 年 月 日...
Oracle will return 2. But I want to return null. Is it any way to do it? what I can think is: select decode(max(case when col_1 is null then 1 else 0), 1, max(col_1), null) from table_1. Is there any better way? Since I need to do the aggregate function twice. Thanks...
运行结果: 2.高级用法:over(partition by XXX)。在不使用Group by语句时候,也可以使用LISTAGG函数: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 WITHTEMPAS(SELECT500POPULATION,'CHINA'NATION,'GUANGZHOU'CITYFROMDUALUNIONALLSELECT1500POPULATION,'CHINA'NATION,'SHANGHAI'CITYFROMDUALUNIONALLSELECT500POPULATIO...
COALESCE returns the first non-null expr in the expression list. You must specify at leasttwoexpressions. If all occurrences of expr evaluate to null, then the function returns null. Oracle Database uses short-circuit evaluation. The database evaluates each expr value and determines whether it i...
Introduction to Oracle NULLIF() function# The OracleNULLIF()function accepts two arguments. It returns a null value if the two arguments are equal. In case the arguments are not equal, theNULLIF()function returns the first argument. The following illustrates the syntax of the OracleNULLIF()funct...
最近在工作中,在写oracle统计查询的时候,遇到listagg聚合函数分组聚合之后出现很多重复数据的问题,于是研究了一下listagg去重的几种方法,以下通过实例讲解三种实现listagg去重的方法。 二、方法 首先还原listagg聚合之后出现重复数据的现象,打开plsql,执行如下sql: ...
The Oracle/PLSQL NULLIF function compares expr1 and expr2. If expr1 and expr2 are equal, the NULLIF function returns NULL. Otherwise, it returns expr1.Syntax The syntax for the NULLIF function in Oracle/PLSQL is: NULLIF( expr1, expr2 ) Parameters or Arguments expr1 First value to compa...
ORA-17158 duration is invalid for this function 持续时间对该函数无效。 ORA-17159 metric value for end-to-end tracing is too long 要执行端对端跟踪的度量值太长。 ORA-17160 execution context id sequence number out of range 执行上下文 ID 序列号超出范围。 ORA-17161 Invalid transaction mode used ...
2. Click an icon on the toolbar to apply a function to the column. The button functions include: 3-12 Oracle Fusion Middleware User's Guide for Oracle Business Activity Monitoring Saving Reports â Group Sort and Value Suppress sorts by group and suppresses duplicate values from ...
为了简单起见,我删除了所有复杂的代码行。以下代码仅返回参数值。我需要在IF BLOCK中使用此参数。然而,我的if块总是返回false,这是因为参数的值为NULL。 create or replace function traudit04011 ( XPARAM IN VARCHAR2) return clob sql_macro as sql_statement varchar2(5000); ...