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You can use following example for building SQL statement. DECLARE @sqlCommand varchar(1000) DECLARE @columnList varchar(75) DECLARE @city varchar(75) SET @columnList = 'CustomerID, ContactName, City' SET @city = '''London''' SET @sqlCommand = 'SELECT ' + @columnList + ' FROM customers WHERE City = ' + @city EXEC (@sqlCommand)
To declare a string variable, use the DECLARE keyword, then type the @variable_name and variable type: char, varchar. To assign a value to a variable, use the keyword SET. The CHAR is a data type with fixed length and loads empty spaces.
16 sie 2023 · Declaring a Single SQL Variable. The T-SQL syntax for declaring a variable in SQL Server is as follows: DECLARE @variable_name data_type [= value]; Declare statement. @variable_name = variable's name. data_type = variable's data type. Value is an (optional) initial value to assign to the variable value.
8 lip 2024 · A Transact-SQL local variable is an object that can hold a single data value of a specific type. Variables in batches and scripts are typically used: As a counter either to count the number of times a loop is performed, or to control how many times the loop is performed.
21 gru 2022 · SQL variables don't exist as an entity but as an object value inside the script. SQL Variable Declaration. As mentioned earlier, we "declare" variables in SQL Server and assign them a datatype and value in a SQL query. We can later use that value to return a result set.
18 mar 2022 · To declare a variable, we need to use the word DECLARE and then specify the name with the @ prefix and then the data type. The following example shows how to declare a variable of type smallint. DECLARE @myvariable smallint.
A variable is an object that holds a single value of a specific type e.g., integer, date, or varying character string. We typically use variables in the following cases: As a loop counter to count the number of times a loop is performed.
