Besides oracle provides NVL and NVL2 functions which can use to convert NULL. Use the special UUID syntax (uuid'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx',. I have a table which contains 'NULL' values which are of type 'Datetime'.

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SQL Server date formatting function – convert datetime to string.

SELECTED SQL DATE/DATETIME FORMATS WITH NAMES *****/.

ALTER TABLE My Table ALTER Column My Column FLOAT NULL.

I get the exception: Implicit conversion from data type datetime to float is not allowed. How to prove that a paper published with a particular English transliteration of my Russian name is mine? The CASE expression is one of my favorite constructs in T-SQL.

NULLIF that you can't see straight, you could also convert it to a CASE statement:.

Let's say you have a table Animals, which has 3 columns: `name`, `is Pet`, `is Dog`.Impala SQL Language never return an empty string; it will only return either a NULL value or a string.re: A handy but little-known T-SQL function: NULLIF().if a Date value is null, you would need to use the Null function NULL (DT_DATE).Syntax Reference, Sample Attacks and Dirty SQL Injection Tricks.ALTER TABLE Employee ALTER COLUMN Full Name nvarchar(50) NOT NULL.