WITH, SELECT, and BULK COLLECT INTO statements

This section is a translation specification. Information may change in the future.

Some parts in the output code are omitted for clarity reasons.

Description

This section is a translation specification for the statement WITH subsequent to a SELECT statement which uses a BULK COLLECT INTO statement. For more information review the following documentation:

Sample Source Patterns

Some parts in the output code are omitted for clarity reasons.

The following query is used for the following examples.

IN -> Oracle_01.sql
-- Sample MySampleTable table
CREATE TABLE MySampleTable (
  MySampleID NUMBER PRIMARY KEY,
  FirstName VARCHAR2(50),
  Salary NUMBER,
  Department VARCHAR2(50)
);

-- Insert some sample data
INSERT INTO MySampleTable (MySampleID, FirstName, Salary, Department)
VALUES (1, 'Bob One', 50000, 'HR');

INSERT INTO MySampleTable (MySampleID, FirstName, Salary, Department)
VALUES (2, 'Bob Two', 60000, 'HR');

INSERT INTO MySampleTable (MySampleID, FirstName, Salary, Department)
VALUES (3, 'Bob Three', 75000, 'IT');

INSERT INTO MySampleTable (MySampleID, FirstName, Salary, Department)
VALUES (4, 'Bob Four', 80000, 'IT');

1. Inside procedure simple case

This is an approach that uses a resultset data type. User-defined types must be reviewed. Review the following Snowflake documentation to review more information about RESULTSETs.

The following example uses a User-defined type and it is declared indirectly as a table. The translation for this case implements a RESULTSET as a data type in Snowflake. The resultset is stored on a variable which must be returned wrapped on a TABLE() function.

Oracle

IN -> Oracle_02.sql
-- Additional Params: -t JavaScript
CREATE OR REPLACE PROCEDURE simple_procedure
IS
  TYPE salary_collection IS TABLE OF NUMBER;
  v_salaries salary_collection := salary_collection();

BEGIN
  WITH IT_Employees AS (
    SELECT Salary
    FROM MySampleTable
    WHERE Department = 'IT'
  )
  SELECT Salary BULK COLLECT INTO v_salaries
  FROM IT_Employees;
END;

CALL simple_procedure();

One of the limitations of the RESULTSETs is that they cannot be used as tables. E.g.: select * from my_result_set; (This is an error, review the following documentation for more information).

Snowflake Scripting

OUT -> Oracle_02.sql
CREATE OR REPLACE PROCEDURE simple_procedure ()
RETURNS STRING
LANGUAGE JAVASCRIPT
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
EXECUTE AS CALLER
AS
$$
  // SnowConvert Helpers Code section is omitted.

  /* ** SSC-EWI-OR0072 - PROCEDURAL MEMBER TYPE DEFINITION NOT SUPPORTED. ** */
  /*   TYPE salary_collection IS TABLE OF NUMBER */
  ;
  /* ** SSC-EWI-OR0104 - UNUSABLE VARIABLE, ITS TYPE WAS NOT TRANSFORMED ** */
  /*   v_salaries salary_collection := salary_collection() */
  ;
  //  WITH IT_Employees AS (
  //    SELECT Salary
  //    FROM MySampleTable
  //    WHERE Department = 'IT'
  //  )
  //  SELECT Salary BULK COLLECT INTO v_salaries
  //  FROM IT_Employees
  !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'WithCte' NODE ***/!!!
  null
$$;

CALL simple_procedure();

2. Simple case for iterations: FOR LOOP statement

The following case is to define a translation for iteration with FOR...LOOP. In this case, the User-defined type is implicitly a table, thus, it is possible to use a cursor to iterate. Review the following documentation to learn more:

Oracle

IN -> Oracle_03.sql
CREATE OR REPLACE PROCEDURE simple_procedure
IS
  TYPE salary_collection IS TABLE OF NUMBER;
  v_salaries salary_collection := salary_collection();
  v_average_salary NUMBER