Replace Null Values with Just a Blank

Replace null values with just a blank

In your select you can put an IsNull/IfNull round the column. Not particularly efficient but does what you want.

MS SQL

Select IsNull(ColName, '') As ColName From TableName

MySQL

Select IfNull(ColName, '') As ColName From TableName

Replace NULL with blank value (SQL Server)

You're mixing numeric and string values.

A NULL is not an empty string. It is the absence of value.

Items like this should really be relegated to the presentation layer, but if you must, try the following cheat.

...
, concat('',sampCol) as sampCol 
...

Replace NULL Values With a Blank Value

You have to convert uniqueidentifier to string type.

isnull(convert(char(36),COB.ParentIdLevel1),'') as 'Parent Option',
isnull(convert(char(36),COB.ParentIdLevel2),'') as 'Parent Option 1',
isnull(convert(char(36),COB.ParentIdLevel3),'') as 'Parent Option 2',
isnull(convert(char(36),COB.ParentIdLevel4),'') as 'Parent Option 3',

Replacing (null) with blank cell in SQL query result

The problem in your query is the following ELSE part of the CASE expression:

 ELSE
     ''

In Oracle, an empty string is considered as NULL value. So, all you need to do is use something else instead of ''.

For example, to use a space instead of NULL:

ELSE 
   ' '

Update The issue is the DbVisualizer tool. OP is on version 8.0.12. Prior to version 9.2.8 it cannot show NULL as an empty string. However, as discussed in this forum, it has been fixed in DbVisualizer 9.2.8.

How to replace null field values with an empty string?

The problem occurs when the subquery returns no values. The isnull() needs to go outside the subquery:

ISNULL( (SELECT TOP 1 a2.AAAREFNUMVALUE
         FROM dbo.AAATOREFNUMS a2
         WHERE a2.AAATRANSPORTTABLE  = a.AAATRANSPORTTABLE  AND 
               a2.AAAREFNUMTYPE = 4 
         ORDER BY a2.AAAREFNUMVALUE
        ), ''
      ) AS "Estimate Number"

Note that this is a situation where ISNULL() is preferred over COALESCE(), because the SQL Server implementation of COALESCE() evaluates the first argument twice when it is not NULL.

However, you might find the query easier to express and faster to run if you use window functions instead:

SELECT DISTINCT a.AAAREFNUMVALUE AS "Pro Number",
       COALESCE(a.AAAREFNUMVALUE_4, '') as "Estimate Number"
FROM (SELECT a.*,
             MAX(CASE WHEN a.AAAREFNUMTYPE = 4 THEN a.AAAREFNUMVALUE END) OVER (PARTITION BY a.AAATRANSPORTTABLE) as AAAREFNUMVALUE_4
      FROM dbo.AAATOREFNUMS a
     ) a INNER JOIN
     dbo.AAATODATES d
     ON a.AAATRANSPORTTABLE = d.AAATRANSPORTTABLE
WHERE a.AAAREFNUMTYPE = 1 AND d.AAADATETYPE = 1  ;

Replace null value to blank

if(jsonObject.has("key"))
{
  if (jsonObject.isNull("key"))
     {
       String value = "";
     }
}

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