How to Substitute a String If Record Is Null in T-Sql

How to Substitute a String if record is NULL in T-SQL

You can use COALESCE or ISNULL. The former is standard and returns the first NOT NULL argument (or NULL if all arguments are NULL)

SELECT COALESCE(micv.value,'Pending') as value

ISNULL is restricted to only 2 arguments but is more efficient in SQL Server if the first value to be tested is expensive to evaluate (e.g. a subquery).

One potential "gotcha" with ISNULL to be aware of is that it returns the datatype of the first parameter so if the string to be substituted is longer than the column datatype would allow you will need a cast.

E.g.

CREATE TABLE T(C VARCHAR(3) NULL);

INSERT T VALUES (NULL);

SELECT ISNULL(C,'Unknown')
FROM T

Would return Unk

But ISNULL(CAST(C as VARCHAR(7)),'Unknown') or COALESCE would both work as desired.

In Tsql, how do i replace a value if the value is not null?

Something like:

SELECT CASE WHEN LEN(eweb) > 0 THEN 'website' ELSE '' END as value
from Web_FacStaffdir 
where eweb is not null

How to use NULL or empty string in SQL

Select *
From Table
Where (col is null or col = '')

Or

Select *
From Table
Where IsNull(col, '') = ''

Replacing NULL and empty string within Select statement

Try this

COALESCE(NULLIF(Address.COUNTRY,''), 'United States')

Replacing NULL with 0 in a SQL server query

When you want to replace a possibly null column with something else, use IsNull.

SELECT ISNULL(myColumn, 0 ) FROM myTable

This will put a 0 in myColumn if it is null in the first place.

How to replace null value with value from the next row

below query works in SQL Server:

;WITH CTE_Value
AS (
    SELECT R#, Value
    FROM @value AS T
    WHERE Value IS NOT NULL

    UNION ALL

    SELECT t.r#, c.Value
    FROM @value AS t
    INNER JOIN CTE_Value AS c ON t.r# + 1 = c.r#
    WHERE t.Value IS NULL
    )
SELECT *
FROM CTE_Value

UNION ALL

SELECT v.*
FROM @value AS v
LEFT JOIN CTE_value AS c ON v.r# = c.r#
WHERE c.r# IS NULL
ORDER BY r#

How to replace NULL with empty string in SQL?

Try IsNull

select ISNULL(Column,'') as ColumnName

OR COALESCE

select COALESCE(NULLIF(ColumnName,''), 'Column')

How to replace null values with a text?

You can use case expression:

select last_name
     , case when commision_pct is null then 'No Commission' else commision_pct end    
from employees;

or coalesce:

select last_name
     , coalesce(commision_pct, 'No Commission')
from employees;

or nvl:

 select last_name
     , nvl(commision_pct, 'No Commission')
from employees;

P.S. In case commision_pct's datatype is not varchar you should also use cast or to_char.

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