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Daily Archives: March 12, 2018

SQL SERVER | How to use Table Variable in Dynamic SQL ? | SQL Interview Question

12 Monday Mar 2018

Posted by Pawan Kumar Khowal in Download SQL Interview Q's, SQL Concepts, SQL Performance Tuning, SQL Puzzles, SQL SERVER, SQL Server Interview Questions, SQL SERVER Puzzles, T SQL Puzzles, Tricky SQL Queries

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SQL SERVER | How to use Table Variable in Dynamic SQL ? | SQL Interview Question

Table-valued parameters provide an easy way to marshal multiple rows of data from a client application to SQL Server without requiring multiple round trips or special server-side logic for processing the data. You can use table-valued parameters to encapsulate rows of data in a client application and send the data to the server in a single parameterized command. The incoming data rows are stored in a table variable that can then be operated on by using Transact-SQL.

In this post we shall understand how we can use the Table Variable Parameter in a dynamic SQL?

Answer – We need to use SP_EXECUTESQL

In this example we create a TestTableVariable table and pass the table variable to insert data using stored procedure.

CREATE TestTableVariable table

--

CREATE TABLE TestTableVariable
(
	 Id Int
	,Vals VARCHAR(100)
)
GO

INSERT INTO TestTableVariable VALUES (1, 'Pawan') ,(2, 'Avtaar') 
GO

--

CREATE aNewType as Table

--

IF EXISTS (SELECT * FROM sys.types WHERE NAME = 'aNewType')
  DROP TYPE aNewType

CREATE TYPE aNewType AS TABLE (Id INT)
GO

--

CREATE stored procedure with table variable as input parameter

--

CREATE PROC MatchingData
(
	@tVariable aNewType READONLY
)
AS
BEGIN
	DECLARE @SQL NVARCHAR(MAX)= N' SELECT s.* FROM TestTableVariable s 
        WHERE EXISTS ( SELECT NULL FROM @tVariable t WHERE t.Id = s.Id ) '	
	DECLARE @defn nvarchar(500) = N' @tVariable aNewType READONLY'; 	
	Execute SP_EXECUTESQL @SQL , @defn , @tVariable
END

--

Call stored procedure passing table valued parameter as input parameter

--

DECLARE @tv AS aNewType
INSERT INTO @tv VALUES (1)
EXEC MatchingData @tv
GO

--

Verify Data for Id = 1 | Matching Data

--

Id          Vals
----------- ----------------
1           Pawan

(1 row affected)

--

Verify Data for Id = 2 | Matching Data

--

Id          Vals
----------- -------------------
2           Avtaar

(1 row affected)

--

Verify Data for Id = 3 | NON Matching Data

--

Id          Vals
----------- ----------

(0 rows affected)

--

Notes/Limitations of table-valued parameter

1. You cannot return data in a table-valued parameter. Table-valued parameters are input-only; the OUTPUT keyword is not supported.

2. You cannot pass table-valued parameters to CLR user-defined functions.

3. Table-valued parameters can only be indexed to support UNIQUE or PRIMARY KEY constraints.

4. SQL Server does not maintain statistics on table-valued parameters.

5. Table-valued parameters are read-only in Transact-SQL code. You cannot update the column values in the rows of a table-valued parameter and you cannot insert or delete rows.

6. If you still want to modify the data that is passed to a stored procedure or parameterized statement in table-valued parameter, you must insert the data into a temporary table or into a table variable.

7. You cannot use ALTER TABLE statements to modify the design of table-valued parameters.

References

1 https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql/table-valued-parameters

Related Post

1 https://msbiskills.com/2018/03/03/sql-server-table-valued-parameters-marshal-multiple-rows-of-data-to-sql/

Add your thoughts in the comments section. Thank you for reading.

Pawan Khowal

Pawan is a SQL Server Developer. If you need any help in writing code/puzzle or training please email at – pawankkmr”AT”gmail.com. Meanwhile please go throgh the top pages from his blog.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
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☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

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2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

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SQL PUZZLE | Can you remove Single/Multiple leading and trailing Commas ? | SQL Interview Question

12 Monday Mar 2018

Posted by Pawan Kumar Khowal in Download SQL Interview Q's, SQL Concepts, SQL Performance Tuning, SQL Puzzles, SQL SERVER, SQL Server Interview Questions, SQL SERVER Puzzles, T SQL Puzzles, Tricky SQL Queries

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SQL PUZZLE | Can you remove Single/Multiple leading and trailing Commas ? | SQL Interview Question

In this puzzle you have to remove leading and trailing commas from a string

For more details please refer sample input and expected output.

Sample Input

Id Val
1 ,,Pawan
2 ,Pawan,,,,,
3 ,
4 ,,Hello,
5 a,a,b,c,,,,,,,,
6 NULL
7

Expected output

Id Val newVal
1 ,,Pawan Pawan
2 ,Pawan,,,,, Pawan
3 , NULL
4 ,,Hello, Hello
5 a,a,b,c,,,,,,,, a,a,b,c
6 NULL NULL
7   NULL

Script – DDL and INSERT sample data

--

CREATE TABLE [RemoveMultipleTrailing&LeadingCommas]
(
	 Id INT
	,Val VARCHAR(100)
)
GO

INSERT INTO [RemoveMultipleTrailing&LeadingCommas] VALUES
(1,',,Pawan'),
(2,',Pawan,,,,,'),
(3,','),
(4,',,Hello,'),
(5,'a,a,b,c,,,,,,,,'),
(6,NULL),
(7,'')
GO

SELECT * FROM [RemoveMultipleTrailing&LeadingCommas]
GO

--

SOLUTION 1 | Using PATINDEX

--

SELECT * , 	
STUFF(LEFT(Val, LEN(Val) - PATINDEX('%[^,]%', REVERSE(Val)) + 1), 1, PATINDEX('%[^,]%', Val) - 1, '') newVal
FROM [RemoveMultipleTrailing&LeadingCommas]

--

OUTPUT 1

--

Id          Val                   newVal
----------- --------------------- ------------------
1           ,,Pawan               Pawan
2           ,Pawan,,,,,           Pawan
3           ,                     NULL
4           ,,Hello,              Hello
5           a,a,b,c,,,,,,,,       a,a,b,c
6           NULL                  NULL
7                                 NULL

(7 rows affected)

--

Enjoy 🙂

Please add comment(s) if you have one or multiple solutions in mind. Thank You.

Pawan Khowal

Pawan is a SQL Server Developer. If you need any help in writing code/puzzle or training please email at – pawankkmr”AT”gmail.com. Meanwhile please go throgh the top pages from his blog.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
☛ SQL Tricky Queries https://msbiskills.com/sql-puzzles-finding-outputs/
☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

2. If you like this post, you may want to join my SQL Server Puzzles on Facebook:
https://www.facebook.com/groups/206594023090781/

My SQL Page on Facebook:

2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

Enjoy !!! Keep Learning

Http://MsbiSkills.com

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