EXPRESSIONS

Translation reference for Oracle expressions to Snow Scripting

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

Description

The following table has a summary of how to transform the different Oracle Expression kinds into Snow Scripting.

Syntax	Conversion status	Notes
Character Expressions	Partial	Partially Supported Common scenarios
Numeric Expressions	Partial	Partially Supported Common scenarios
Date Expressions	Partial	Partially Supported Common scenarios
Boolean Expressions	Partial	Not supported boolean expressions
Simple Case Expressions	Full	N/A
Searched Case Expressions	Full	N/A
Collection Constructor	Not Translated	Snowflake does not have a native equivalent for Oracle collections. See Collections and Records.
Qualified Expressions	Not Translated	Snowflake does not have a native equivalent for Oracle record types. See Collections and Records.

Partially supported common scenarios

Oracle Constants

For more information, check the Oracle Constant declaration section.

Oracle

Query

IN -> Oracle_01.sql

CREATE TABLE EXPRESSIONS_TABLE(col VARCHAR(30));
CREATE OR REPLACE PROCEDURE EXPRESSIONS_SAMPLE
IS
RESULT VARCHAR(50);
CONST CONSTANT VARCHAR(20) := 'CONSTANT TEXT';
BEGIN
	-- CONSTANT EXPRESSIONS
	RESULT := CONST;
	INSERT INTO EXPRESSIONS_TABLE(COL) VALUES (RESULT);
END;

CALL EXPRESSIONS_SAMPLE();
SELECT * FROM EXPRESSIONS_TABLE;

Result

|COL          |
|-------------|
|CONSTANT TEXT|

Snowflake

Query

OUT -> Oracle_01.sql

CREATE OR REPLACE TABLE EXPRESSIONS_TABLE (col VARCHAR(30))
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
;

CREATE OR REPLACE PROCEDURE EXPRESSIONS_SAMPLE ()
RETURNS VARCHAR
LANGUAGE SQL
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
EXECUTE AS CALLER
AS
$$
	DECLARE
		RESULT VARCHAR(50);
		--** SSC-FDM-0016 - CONSTANTS ARE NOT SUPPORTED BY SNOWFLAKE SCRIPTING. IT WAS TRANSFORMED TO A VARIABLE **
		CONST VARCHAR(20) := 'CONSTANT TEXT';
	BEGIN
		-- CONSTANT EXPRESSIONS
		RESULT := :CONST;
		INSERT INTO EXPRESSIONS_TABLE(COL) VALUES (:RESULT);
	END;
$$;

CALL EXPRESSIONS_SAMPLE();

SELECT * FROM
	EXPRESSIONS_TABLE;

Result

|COL          |
|-------------|
|CONSTANT TEXT|

Not supported numeric expressions

Oracle

Query

CREATE TABLE NUMERIC_EXPRESSIONS_TABLE(col number);

CREATE OR REPLACE PROCEDURE NUMERIC_EXPRESSIONS
IS
RESULT NUMBER;
CURSOR C1 IS SELECT * FROM NUMERIC_EXPRESSIONS_TABLE;
TYPE NUMERIC_TABLE IS TABLE OF NUMBER(10);
COLLECTION NUMERIC_TABLE; 
BEGIN
	-- CURSOR EXPRESSIONS
	OPEN C1;
	RESULT := C1%ROWCOUNT;
	CLOSE C1;
	INSERT INTO NUMERIC_EXPRESSIONS_TABLE(COL) VALUES (RESULT);
	
	-- ** OPERATOR
	RESULT := 10 ** 2;
	INSERT INTO NUMERIC_EXPRESSIONS_TABLE(COL) VALUES (RESULT);
	
	-- COLLECTION EXPRESSIONS
	COLLECTION := NUMERIC_TABLE(1, 2, 3, 4, 5, 6); 
	RESULT := COLLECTION.COUNT + COLLECTION.FIRST;
	INSERT INTO NUMERIC_EXPRESSIONS_TABLE(COL) VALUES (RESULT);

	-- IMPLICIT CURSOR EXPRESSIONS
	UPDATE NUMERIC_EXPRESSIONS_TABLE SET COL = COL + 4;
	RESULT := SQL%ROWCOUNT;
	INSERT INTO NUMERIC_EXPRESSIONS_TABLE(COL) VALUES (RESULT);
END;

CALL NUMERIC_EXPRESSIONS();
SELECT * FROM NUMERIC_EXPRESSIONS_TABLE;

Result

|COL|
|---|
|4  |
|104|
|11 |
|3  |

Not supported boolean expressions

Oracle

Query

--Aux function to convert BOOLEAN to VARCHAR
CREATE OR REPLACE FUNCTION convert_bool(p1 in BOOLEAN)
RETURN VARCHAR
AS
var1 VARCHAR(20) := 'FALSE';
BEGIN
IF p1 THEN
var1 := 'TRUE';
END IF;
RETURN var1;
END;

--Table
CREATE TABLE t_boolean_table
(
conditional_predicate VARCHAR(20),
collection_variable VARCHAR(20),
sql_variable VARCHAR(20)
)

--Main Procedure
CREATE OR REPLACE PROCEDURE p_boolean_limitations
AS

TYPE varray_example IS VARRAY(4) OF VARCHAR(15);
colection_example varray_example := varray_example('John', 'Mary', 'Alberto', 'Juanita');
collection_variable BOOLEAN;
conditional_predicate BOOLEAN;
sql_variable BOOLEAN;

--Result variables
col1 VARCHAR(20);
col2 VARCHAR(20);
col3 VARCHAR(20);
BEGIN

--Conditional predicate
conditional_predicate := INSERTING;

--Collection.EXISTS(index)
collection_variable := colection_example.EXISTS(2);

--Cursor FOUND / NOTFOUND / ISOPEN
sql_variable:= SQL%FOUND OR SQL%NOTFOUND OR SQL%ISOPEN;

--Convert BOOLEAN to VARCHAR to insert
col1 := convert_bool(conditional_predicate);
col2 := convert_bool(collection_variable);
col3 := convert_bool(sql_variable);

INSERT INTO t_boolean_table VALUES (col1, col2, col3);

END;

CALL p_boolean_limitations();

SELECT * FROM t_boolean_table;

Related EWIs.

1. SSC-FDM-0016: Constants are not supported by Snowflake Scripting. It was transformed to a variable.