TRY PARSE function in SQL Server 2012 скачать в хорошем качестве

TRY PARSE function in SQL Server 2012

sql server tryparse try_parse in sql server 2012 try parse int sql server In this video we will discuss TRY_PARSE function Difference between PARSE and TRY_PARSE functions Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help.    / @aarvikitchen5572   TRY_PARSE function Introduced in SQL Server 2012 Converts a string to Date/Time or Numeric type Returns NULL if the provided string cannot be converted to the specified data type Requires .NET Framework Common Language Runtime (CLR) Syntax : TRY_PARSE ( string_value AS data_type ) Example : Convert string to INT. As the string can be converted to INT, the result will be 99 as expected. SELECT TRY_PARSE('99' AS INT) AS Result Example : Convert string to INT. The string cannot be converted to INT, so TRY_PARSE returns NULL SELECT TRY_PARSE('ABC' AS INT) AS Result Use CASE statement or IIF function to provide a meaningful error message instead of NULL when the conversion fails. Example : Using CASE statement to provide a meaningful error message when the conversion fails. SELECT CASE WHEN TRY_PARSE('ABC' AS INT) IS NULL THEN 'Conversion Failed' ELSE 'Conversion Successful' END AS Result Output : As the conversion fails, you will now get a message 'Conversion Failed' instead of NULL Example : Using IIF function to provide a meaningful error message when the conversion fails. SELECT IIF(TRY_PARSE('ABC' AS INT) IS NULL, 'Conversion Failed', 'Conversion Successful') AS Result What is the difference between PARSE and TRY_PARSE PARSE will result in an error if the conversion fails, where as TRY_PARSE will return NULL instead of an error. Since ABC cannot be converted to INT, PARSE will return an error SELECT PARSE('ABC' AS INT) AS Result Since ABC cannot be converted to INT, TRY_PARSE will return NULL instead of an error SELECT TRY_PARSE('ABC' AS INT) AS Result Example : Using TRY_PARSE() function with table data. We will use the following Employees table for this example. SQL Script to create Employees table Create table Employees ( Id int primary key identity, Name nvarchar(10), Age nvarchar(10) ) Go Insert into Employees values ('Mark', '40') Insert into Employees values ('John', '20') Insert into Employees values ('Amy', 'THIRTY') Insert into Employees values ('Ben', '21') Insert into Employees values ('Sara', 'FIFTY') Insert into Employees values ('David', '25') Go The data type of Age column is nvarchar. So string values like (THIRTY, FIFTY ) are also stored. Now, we want to write a query to convert the values in Age column to int and return along with the Employee name. Notice TRY_PARSE function returns NULL for the rows where age cannot be converted to INT. SELECT Name, TRY_PARSE(Age AS INT) AS Age FROM Employees If you use PARSE instead of TRY_PARSE, the query fails with an error. SELECT NAME, PARSE(Age AS INT) AS Age FROM Employees The above query returns the following error Error converting string value 'THIRTY' into data type int using culture Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenka... Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspo...