在oracle中仅选择没有null或空值的列 [英] Select only columns without null or blank values in oracle

问题描述

How can I select only columns that don't have null value

col1 col2 col3
20    12   null
25    null     null

Desired output

col1 col2 
20    12  
25    null

我尝试了什么：



没有办法出来.................................................. .....

What I have tried:

Not getting way to come out.......................................................

推荐答案

结果集的结构本质上是静态的。换句话说，你在构建查询时决定列。



据我所知，你几乎没有选择：



1.首先运行查询以查看哪些列包含数据，然后使用仅包含所需列的动态构建的SELECT子句再次运行查询

2.将数据读取到单个，XML列，适当处理

3.获取所有列并处理客户端格式化



从这些，选项3最多因为SQL不是为格式化而设计的，只是提取和操作数据。

The structure of the result set is static in nature. In other words, you decide the columns when you build the query.

As far as I can see, you have few options:

1. first run a query to see which columns contain data and then run a query again with dynamically built SELECT clause containing only desired columns
2. Fetch the data into a single, XML column, handle appropriately
3. Fetch all the columns and handle formatting on client side

From those, option 3 makes most sense since SQL isn't designed for formatting, just fetching and manipulating data.

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