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Description

This error indicates that an attempt was made to assign a value to a variable in an SAP HANA SQLScript procedure or function using an invalid single assignment operation. It typically occurs when the expected result for a single variable assignment is violated, such as receiving multiple values where only one is permitted, or due to incorrect syntax.

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Error Message

ERR_SQLSCRIPT_INVALID_SINGLE_ASSIGNMENT

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Known Causes

3 known causes

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Scalar Variable Multiple Values

A scalar variable, designed to hold a single value, is being assigned a result set that contains multiple rows or columns from a query or expression.

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Invalid Assignment Syntax

The SQLScript statement used for the assignment contains a syntax error or does not conform to the rules for single variable assignments in SAP HANA SQLScript.

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Data Type Mismatch

The data type of the value being assigned is incompatible with the declared data type of the target variable, preventing a valid assignment.

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Solutions

3 solutions available

1. Review and Correct SQLScript Assignment Syntax easy

Identify and fix the incorrect assignment statement within the SQLScript code.

1

Locate the SQLScript code that is causing the error. This could be within a stored procedure, function, or a direct SQLScript execution.

Example of an invalid assignment:
SELECT * FROM my_table INTO invalid_variable;

Example of a valid assignment:
SELECT COUNT(*) INTO record_count FROM my_table;

2

Examine each assignment statement (e.g., `variable = expression`, `SELECT ... INTO variable`). Ensure that the target variable exists and is of a compatible data type with the expression or the selected column.

Ensure variable declaration matches the assignment:
DECLARE my_var INT;
my_var = 10; -- Valid

my_var = 'some string'; -- Invalid if my_var is INT

3

Verify that you are not attempting to assign a multi-row result set to a single variable unless explicitly handled (e.g., using `FOR` loops or ensuring the `SELECT` statement returns at most one row).

Invalid for single variable:
SELECT column1, column2 INTO my_single_variable FROM my_table WHERE id = 1;

Correct approach if expecting one row:
SELECT column1 INTO my_variable FROM my_table WHERE id = 1;

Correct approach if expecting multiple rows (using a loop):
FOR rec IN (
  SELECT column1 FROM my_table
) DO
  -- Process rec.column1
END FOR;

4

If the error occurs in a HANA SQL Script procedure or function, ensure the assignment is within the correct procedural block and adheres to HANA SQL Script syntax rules.

Example of a valid HANA SQL Script assignment within a procedure:
CREATE PROCEDURE my_procedure (IN input_param INT, OUT output_param VARCHAR(100))
LANGUAGE SQLSCRIPT
AS
BEGIN
  DECLARE temp_var INT;
  temp_var = input_param * 2;
  output_param = 'Result: ' || temp_var;
END;

2. Verify Variable Declaration and Data Types medium

Ensure all variables used in assignments are declared and have compatible data types.

1

Identify all variables involved in assignment statements within the problematic SQLScript code.

Look for statements like `variable = ...` or `SELECT ... INTO variable`.

2

Check the `DECLARE` statements for each identified variable. Ensure that the declared data type is appropriate for the value being assigned.

Example:
DECLARE v_customer_name VARCHAR(255);
DECLARE v_order_count INT;

v_customer_name = 'John Doe'; -- Valid
v_order_count = 15; -- Valid

3

Pay close attention to implicit type conversions. While HANA SQLScript supports some implicit conversions, it's best practice to explicitly cast data types to avoid unexpected errors.

Example of explicit casting:
DECLARE v_numeric_string VARCHAR(50);
DECLARE v_number INT;

v_numeric_string = '12345';
v_number = CAST(v_numeric_string AS INT); -- Explicitly cast string to INT

4

If a variable is intended to hold a result from a `SELECT` statement, ensure its declared data type matches the data type of the selected column(s).

Example:
-- Assuming 'order_date' in the table is of type DATE
DECLARE v_order_date DATE;
SELECT order_date INTO v_order_date FROM orders WHERE order_id = 123;

-- If 'order_date' was VARCHAR, you'd need to cast:
-- DECLARE v_order_date DATE;
-- SELECT CAST(order_date AS DATE) INTO v_order_date FROM orders WHERE order_id = 123;

3. Examine Target Table/View Definitions medium

Confirm that the target of the assignment in `SELECT ... INTO` statements has compatible column definitions.

1

Identify `SELECT ... INTO` statements in the SQLScript code that are failing.

Example:
SELECT customer_id, order_date INTO v_cust_id, v_ord_date FROM orders WHERE order_id = 123;

2

For each `SELECT ... INTO` statement, verify the data types of the columns being selected from the source table/view.

Use SQL Developer or HANA Studio to inspect the table/view schema:
DESCRIBE <table_name>;

Or query the information schema:
SELECT COLUMN_NAME, DATA_TYPE FROM SYS.TABLE_COLUMNS WHERE SCHEMA_NAME = 'YOUR_SCHEMA' AND TABLE_NAME = 'YOUR_TABLE';

3

Compare these data types with the declared data types of the target variables. If there's a mismatch, you may need to cast the selected columns or adjust the variable declarations.

If `order_date` is VARCHAR in the table but you need it as DATE:
SELECT customer_id, CAST(order_date AS DATE) INTO v_cust_id, v_ord_date FROM orders WHERE order_id = 123;

4

Ensure that the number of columns selected matches the number of target variables in the `INTO` clause.

Incorrect:
SELECT column1 INTO var1, var2 FROM my_table;

Correct:
SELECT column1, column2 INTO var1, var2 FROM my_table;

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Related Errors

5 related errors

SAP S/4HANA Error 1308: Invalid SQLScript Assignment