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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.
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