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Description

Error 1309, ERR_SQLSCRIPT_INVALID_USE_OF_TABLE_VARIABLE, indicates an incorrect or disallowed operation involving a table variable within an SAP HANA SQLScript procedure or function. This typically occurs during the execution of custom code in SAP S/4HANA extensions, preventing the successful completion of the script.

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Error Message

ERR_SQLSCRIPT_INVALID_USE_OF_TABLE_VARIABLE

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Known Causes

3 known causes

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Incorrect Assignment or Manipulation

A table variable might be assigned a value with an incompatible structure or data types, or manipulated in a way not supported by SQLScript for temporary table variables.

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Scope or Lifetime Mismatch

The table variable is referenced outside its defined scope within the SQLScript block, or its lifetime has ended before the attempted use.

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Misuse in DDL/DML Statements

Attempting to use a table variable directly in Data Definition Language (DDL) statements or certain Data Manipulation Language (DML) operations that expect persistent database objects.

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Solutions

3 solutions available

1. Correct Table Variable Declaration and Initialization medium

Ensures table variables are declared with the correct structure and initialized before use.

1

Review the SQLScript procedure or function where the error occurs. Identify the table variable declaration.

DECLARE my_table_var <TABLE_TYPE>;
-- or
my_table_var <TABLE_TYPE>;

2

Verify that `<TABLE_TYPE>` accurately reflects the structure of the data you intend to store in the table variable. This could be a specific ABAP DDIC structure or a custom table type. If using a DDIC structure, ensure it's correctly referenced.

DECLARE my_table_var <ABAP_DDIC_STRUCTURE_NAME> READTABLE;
-- or if it's a custom table type
DECLARE my_table_var <CUSTOM_TABLE_TYPE_NAME>;

3

Ensure the table variable is initialized or populated before any operations that attempt to read from it (e.g., SELECT INTO, FOR loop). Common initialization methods include SELECT statements.

SELECT * INTO my_table_var FROM <SOURCE_TABLE> WHERE <condition>;
-- or
my_table_var = SELECT * FROM <SOURCE_TABLE> WHERE <condition>;

4

If the table variable is intended to be empty initially, ensure it's declared as such and then populated later. An uninitialized table variable used in a SELECT INTO statement will lead to this error.

DECLARE my_table_var <TABLE_TYPE>;
-- ... some logic ...
SELECT column1, column2 INTO my_table_var FROM another_table WHERE ...;

2. Validate Table Variable Scope and Lifecycle medium

Checks that table variables are used within their defined scope and are not accessed after being deallocated or reset.

1

Examine the SQLScript code for the table variable's declaration and its usage. Table variables are typically declared within procedures, functions, or anonymous blocks.

CREATE PROCEDURE my_procedure (...) LANGUAGE SQLSCRIPT AS
BEGIN
  DECLARE my_table_var <TABLE_TYPE>;
  -- ... usage of my_table_var ...
END;

2

Ensure that attempts to read from or write to the table variable do not occur *before* its declaration and initialization within the current scope.

BEGIN
  -- ERROR: my_table_var is not yet declared or initialized
  my_table_var = SELECT * FROM some_table;

  DECLARE my_table_var <TABLE_TYPE>;
  my_table_var = SELECT * FROM some_table;
END;

3

If the table variable is used in a loop (e.g., `FOR row IN my_table_var DO ... ENDFOR;`), ensure the loop is correctly structured and the table variable is not modified in a way that invalidates the iteration.

DECLARE my_table_var <TABLE_TYPE>;
my_table_var = SELECT * FROM source_table;

FOR record IN my_table_var DO
  -- Safely process record
ENDFOR;

4

Be mindful of nested procedures or functions. A table variable declared in an outer scope is not directly accessible in an inner scope unless explicitly passed as a parameter. Conversely, a table variable declared in an inner scope is not accessible outside of it.

CREATE PROCEDURE outer_proc() LANGUAGE SQLSCRIPT AS
BEGIN
  DECLARE outer_tv <TABLE_TYPE>;
  -- ...
  CALL inner_proc(outer_tv); -- Pass as parameter
END;

CREATE PROCEDURE inner_proc(IN tv <TABLE_TYPE>) LANGUAGE SQLSCRIPT AS
BEGIN
  -- Use tv here
END;

3. Review Data Type Mismatches medium

Addresses potential issues where data types between the source and the table variable do not align.

1

When populating a table variable using `SELECT INTO` or assignment (`=`), meticulously check the data types of the columns being selected against the data types of the corresponding columns in the table variable definition.

DECLARE my_table_var TABLE (
  col1 INT,
  col2 VARCHAR(50)
);

-- If source_table.colA is DECIMAL, it won't directly map to INT without casting
SELECT colA, colB INTO my_table_var FROM source_table;
-- Corrected:
SELECT CAST(colA AS INT), colB INTO my_table_var FROM source_table;

2

Use explicit casting (`CAST`) or conversion functions within the `SELECT` statement to ensure data type compatibility. This is especially important for numeric types, date/time types, and string lengths.

DECLARE my_table_var TABLE (
  numeric_col DECIMAL(10,2),
  date_col DATE
);

SELECT CAST(source_numeric AS DECIMAL(10,2)), CAST(source_date AS DATE) INTO my_table_var FROM source_table;

3

Pay close attention to string lengths. If a string from the source is longer than the defined length in the table variable, it can lead to truncation or errors. Either adjust the table variable definition or ensure proper handling of string lengths during population.

DECLARE my_table_var TABLE (
  short_string VARCHAR(10)
);

-- If source_string is longer than 10 characters, this might fail or truncate
SELECT source_string INTO my_table_var FROM source_table;
-- Consider:
SELECT SUBSTRING(source_string, 1, 10) INTO my_table_var FROM source_table; -- if truncation is acceptable

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Related Errors

5 related errors

SAP S/4HANA Error 1309: Invalid SQLScript Table Variable Use