How Can I Pass R Variables to SQL Queries Using RODBC's sqlQuery Function?

Pass R Variable to RODBC's sqlQuery

In the RODBC package, passing R variables to the sqlQuery function enables dynamic query execution. Here's how to achieve this for various scenarios:

Scalar/Table-Valued Function and Stored Procedure

To pass a variable to a scalar/table-valued function or stored procedure, use the paste() function to construct the query string. For instance:

x <- 1
example <- sqlQuery(myDB, paste("SELECT * FROM dbo.my_table_fn (", x, ")"))

WHERE Clause

To pass a variable to the WHERE clause of a SELECT statement, use the sprintf() function:

example2 <- sqlQuery(myDB, sprintf("SELECT * FROM dbo.some_random_table AS foo WHERE foo.ID = %d", x))

Stored Procedure Execution

To execute a stored procedure with an argument, use sprintf:

example3 <- sqlQuery(myDB, sprintf("EXEC dbo.my_stored_proc (%d)", x))

By constructing the query string dynamically, you can pass R variables as arguments to SQL functions and statements.

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