SnowConvert AI – Oracle – Create Table

In this section you could find information about TABLES, their syntax and current conversions.

Beschreibung

In Oracle wird die CREATE TABLE-Anweisung verwendet, um eine der folgenden Arten von Tabellen zu erstellen: eine relationale Tabelle, die die Grundstruktur für die Speicherung von Benutzerdaten darstellt, oder eine Objekttabelle, die einen Objekttyp für eine Spaltendefinition verwendet. (Oracle-Dokumentation)

Oracle-Syntax

CREATE [ { GLOBAL | PRIVATE } TEMPORARY | SHARDED | DUPLICATED | [ IMMUTABLE ] BLOCKCHAIN 
  | IMMUTABLE  ] 
   TABLE
  [ schema. ] table
  [ SHARING = { METADATA | DATA | EXTENDED DATA | NONE } ]
  { relational_table | object_table | XMLType_table }
  [ MEMOPTIMIZE FOR READ ]
  [ MEMOPTIMIZE FOR WRITE ]
  [ PARENT [ schema. ] table ] ;

Snowflake-Syntax

CREATE [ OR REPLACE ]
    [ { [ { LOCAL | GLOBAL } ] TEMP | TEMPORARY | VOLATILE | TRANSIENT } ]
  TABLE [ IF NOT EXISTS ] <table_name> (
    -- Column definition
    <col_name> <col_type>
      [ inlineConstraint ]
      [ NOT NULL ]
      [ COLLATE '<collation_specification>' ]
      [
        {
          DEFAULT <expr>
          | { AUTOINCREMENT | IDENTITY }
            [
              {
                ( <start_num> , <step_num> )
                | START <num> INCREMENT <num>
              }
            ]
            [ { ORDER | NOORDER } ]
        }
      ]
      [ [ WITH ] MASKING POLICY <policy_name> [ USING ( <col_name> , <cond_col1> , ... ) ] ]
      [ [ WITH ] TAG ( <tag_name> = '<tag_value>' [ , <tag_name> = '<tag_value>' , ... ] ) ]
      [ COMMENT '<string_literal>' ]

    -- Additional column definitions
    [ , <col_name> <col_type> [ ... ] ]

    -- Out-of-line constraints
    [ , outoflineConstraint [ ... ] ]
  )
  [ CLUSTER BY ( <expr> [ , <expr> , ... ] ) ]
  [ ENABLE_SCHEMA_EVOLUTION = { TRUE | FALSE } ]
  [ STAGE_FILE_FORMAT = (
     { FORMAT_NAME = '<file_format_name>'
       | TYPE = { CSV | JSON | AVRO | ORC | PARQUET | XML } [ formatTypeOptions ]
     } ) ]
  [ STAGE_COPY_OPTIONS = ( copyOptions ) ]
  [ DATA_RETENTION_TIME_IN_DAYS = <integer> ]
  [ MAX_DATA_EXTENSION_TIME_IN_DAYS = <integer> ]
  [ CHANGE_TRACKING = { TRUE | FALSE } ]
  [ DEFAULT_DDL_COLLATION = '<collation_specification>' ]
  [ COPY GRANTS ]
  [ COMMENT = '<string_literal>' ]
  [ [ WITH ] ROW ACCESS POLICY <policy_name> ON ( <col_name> [ , <col_name> ... ] ) ]
  [ [ WITH ] TAG ( <tag_name> = '<tag_value>' [ , <tag_name> = '<tag_value>' , ... ] ) ]

Bemerkung

Weitere Informationen zu Snowflake finden Sie in der folgenden Dokumentation.

Beispielhafte Quellcode-Muster

2.1. Physische und tabellarische Eigenschaften

Oracle

CREATE TABLE "MySchema"."BaseTable"
(
    BaseId NUMBER DEFAULT 10 NOT NULL ENABLE
) SEGMENT CREATION IMMEDIATE
  PCTFREE 0 PCTUSED 40 INITRANS 1 MAXTRANS 255
  COLUMN STORE COMPRESS FOR QUERY HIGH NO ROW LEVEL LOCKING LOGGING
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "MyTableSpace"
  PARTITION BY LIST ("BaseId")
 (
    PARTITION "P20211231"  VALUES (20211231) SEGMENT CREATION DEFERRED
    PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
    ROW STORE COMPRESS ADVANCED LOGGING
    STORAGE(
    BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
    TABLESPACE "MyTableSpace" 
  )
  PARALLEL;

Snowflake

CREATE OR REPLACE TABLE "MySchema"."BaseTable"
 (
     BaseId NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ DEFAULT 10 NOT NULL
 )
 COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
 ;

Bemerkung

Tabelleneigenschaften werden entfernt, da sie nach der Migration in Snowflake nicht mehr benötigt werden.

2.2. Einschränkungen und Einschränkungsstatus

CHECK Constraints

Snowflake supports CHECK constraints with deterministic, scalar expressions. Oracle-specific state clauses (DEFERRABLE, RELY, INITIALLY, ENABLE, DISABLE) are removed during conversion with SSC-FDM-0046 annotations. CHECK constraints with unsupported expressions (UDFs, non-deterministic functions) are flagged with SSC-EWI-0116.

Supported:

  • Basic CHECK constraints with scalar, deterministic expressions

  • Column-level and table-level CHECK constraints

  • Named and unnamed constraints

Removed automatically (with SSC-FDM-0046):

  • [NOT] DEFERRABLE - Snowflake always validates immediately

  • [NOT] RELY - Optimizer hint not supported

  • INITIALLY IMMEDIATE / INITIALLY DEFERRED

  • ENABLE / DISABLE - Snowflake constraints are always enforced

Unsupported (flagged with SSC-EWI-0116):

  • User-defined functions (UDFs)

  • Non-deterministic built-in functions

  • Context-dependent functions

  • Subqueries

Example 1: Basic CHECK Constraint
Oracle
CREATE TABLE Products (
  ProductID NUMBER PRIMARY KEY,
  Price NUMBER(10,2) CHECK (Price > 0),
  Quantity NUMBER CHECK (Quantity >= 0 AND Quantity <= 1000)
);
Snowflake
CREATE OR REPLACE TABLE Products (
  ProductID NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ PRIMARY KEY,
  Price NUMBER(10, 2) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ CHECK (Price > 0),
  Quantity NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ CHECK (Quantity >= 0
  AND Quantity <= 1000)
)
;
Example 2: CHECK Constraint with NOT DEFERRABLE (Removed)

The NOT DEFERRABLE clause is removed with SSC-FDM-0046 because Snowflake always validates CHECK constraints immediately.

Oracle
CREATE TABLE Accounts (
  AccountID NUMBER PRIMARY KEY,
  Balance NUMBER(15,2) CHECK (Balance >= -1000) NOT DEFERRABLE
);
Snowflake
CREATE OR REPLACE TABLE Accounts (
  AccountID NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ PRIMARY KEY,
  Balance NUMBER(15, 2) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/
                                                                                                          --** SSC-FDM-0046 - UNSUPPORTED CHECK CONSTRAINT CLAUSE REMOVED: [NOT] DEFERRABLE **
                                                                                                          CHECK (Balance >= -1000)
)
;
Example 3: CHECK Constraint with RELY Clause (Removed)
Oracle
CREATE TABLE Orders (
  OrderID NUMBER PRIMARY KEY,
  TotalAmount NUMBER(10,2) CONSTRAINT CHK_Amount CHECK (TotalAmount > 0) RELY
);
Snowflake
CREATE OR REPLACE TABLE Orders (
  OrderID NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ PRIMARY KEY,
  TotalAmount NUMBER(10, 2) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/
                                                                                                              --** SSC-FDM-0046 - UNSUPPORTED CHECK CONSTRAINT CLAUSE REMOVED: [NOT] RELY **
                                                                                                              CONSTRAINT CHK_Amount CHECK (TotalAmount > 0)
)
;
Example 4: CHECK Constraint with Unresolved Function (Unsupported)

When a CHECK constraint references a function that cannot be resolved, it is flagged with SSC-EWI-0116 as a user-defined function.

Oracle
CREATE TABLE Invoices (
  InvoiceID NUMBER NOT NULL,
  TaxCode VARCHAR2(10),
  CONSTRAINT chk_tax_code CHECK (validate_tax_code(TaxCode) = 1)
);
Snowflake
CREATE OR REPLACE TABLE Invoices (
  InvoiceID NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ NOT NULL,
  TaxCode VARCHAR(10),
  CONSTRAINT chk_tax_code
                          !!!RESOLVE EWI!!! /*** SSC-EWI-0116 - CHECK CONSTRAINT WITH user-defined function IS NOT SUPPORTED IN SNOWFLAKE ***/!!!
                          CHECK(validate_tax_code(TaxCode) = 1)
)
;

Bemerkung

The USING INDEX constraint clause is entirely removed from the output code during the conversion.

NOT NULL Constraint States

In case you have any constraint state after a NOT NULL constraint as follows:

  • RELY

  • NO RELY

  • RELY ENABLE

  • RELY DISABLE

  • VALIDATE

  • NOVALIDATE

Diese werden ebenfalls auskommentiert.

Bemerkung

Der ENABLE-Status wird bei der Konvertierung vollständig aus dem Ausgabecode entfernt. Im Falle des DISABLE-Status wird er gleichzeitig mit der Einschränkung NOT NULL entfernt.

Oracle

CREATE TABLE Table1(
  col1 INT NOT NULL ENABLE,
  col2 INT NOT NULL DISABLE,
  col3 INT NOT NULL RELY
);

Snowflake

CREATE OR REPLACE TABLE Table1 (
    col1 INT NOT NULL,
    col2 INT ,
    col3 INT NOT NULL /*** SSC-FDM-OR0006 - CONSTRAINT STATE RELY REMOVED FROM NOT NULL INLINE CONSTRAINT ***/
  )
  COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
  ;

2.3. Fremdschlüssel

Wenn es eine Tabelle mit einer NUMBER-Spalte ohne Genauigkeit oder Skalierung gibt und eine andere Tabelle mit einer NUMBER(*, 0)-Spalte, die auf die zuvor erwähnte NUMBER-Spalte verweist, kommentieren wir diesen Fremdschlüssel aus.

Oracle

CREATE TABLE "MySchema"."MyTable"
(
    "COL1" NUMBER, 
    CONSTRAINT "PK" PRIMARY KEY ("COL1")
);

Snowflake

CREATE OR REPLACE TABLE "MySchema"."MyTable"
    (
        "COL1" NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/,
        CONSTRAINT "PK" PRIMARY KEY ("COL1")
    )
    COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
    ;

2.4. Virtuelle Spalte

Oracle

CREATE TABLE "MySchema"."MyTable"
(
    "COL1" NUMBER GENERATED ALWAYS AS (COL1 * COL2) VIRTUAL
);

Snowflake

CREATE OR REPLACE TABLE "MySchema"."MyTable"
    (
        "COL1" NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ AS (COL1 * COL2)
    )
    COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
    ;

2.5. Identitätsspalte

Für Identitätsspalten wird eine Sequenz erstellt und der Spalte zugewiesen.

Oracle

CREATE TABLE "MySchema"."BaseTable"
(
	"COL0" NUMBER GENERATED BY DEFAULT ON NULL 
		AS IDENTITY MINVALUE 1 MAXVALUE 9999999999999999999999999999 
		INCREMENT BY 1 
		START WITH 621 
		CACHE 20 
		NOORDER  NOCYCLE  NOT NULL ENABLE
);

Snowflake

CREATE OR REPLACE TABLE "MySchema"."BaseTable"
	(
		"COL0" NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/ IDENTITY(621, 1) ORDER NOT NULL
	)
	COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "oracle",  "convertedOn": "07/16/2025",  "domain": "no-domain-provided" }}'
	;

2.6. CLOB- und BLOB-Spaltendeklaration

Spalten, die als CLOB oder BLOB deklariert sind, werden in VARCHAR geändert.

Oracle

CREATE TABLE T
(
 Col1 BLOB DEFAULT EMPTY_BLOB(),
Col5 CLOB DEFAULT EMPTY_CLOB()
);

Snowflake

CREATE OR REPLACE TABLE T
 (
  Col1 BINARY,
 Col5 VARCHAR
 )
 COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
 ;

2.7. Name der Einschränkung

Warnung

Der Name der Einschränkung wird aus dem Code entfernt, da er in Snowflake nicht anwendbar ist.

Oracle

CREATE TABLE "CustomSchema"."BaseTable"(
 "PROPERTY" VARCHAR2(64) CONSTRAINT "MICROSOFT_NN_PROPERTY" NOT NULL ENABLE
  );

Snowflake

CREATE OR REPLACE TABLE "CustomSchema"."BaseTable" (
  "PROPERTY" VARCHAR(64) NOT NULL /*** SSC-FDM-0012 - CONSTRAINT NAME '"MICROSOFT_NN_PROPERTY"' IN NULL OR NOT NULL CONSTRAINT IS NOT SUPPORTED IN SNOWFLAKE ***/
   )
   COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
   ;

2.8. Standardspalten mit Zeiten

Die Spalten, die als Datumstypen deklariert sind, werden so umgewandelt, dass sie mit dem spezifischen Datumstyp übereinstimmen.

Oracle

CREATE TABLE TABLE1
(
"COL1" VARCHAR(50) DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE TABLE1
(
 COL0 TIMESTAMP(6) DEFAULT CURRENT_TIMESTAMP,
 COL1 TIMESTAMP(6) DEFAULT CURRENT_TIME,
 COL2 TIMESTAMP(6) WITH LOCAL TIME ZONE DEFAULT '1900-01-01 12:00:00',
 COL3 TIMESTAMP(6) WITH TIME ZONE DEFAULT '1900-01-01 12:00:00',
 COL4 TIMESTAMP(6) WITHOUT TIME ZONE DEFAULT '1900-01-01 12:00:00',
 COL5 TIMESTAMP(6) DEFAULT TO_TIMESTAMP('01/01/1900 12:00:00.000000 AM', 'MM/DD/YYYY HH:MI:SS.FF6 AM')
 );

Snowflake

CREATE OR REPLACE TABLE TABLE1
 (
 "COL1" VARCHAR(50) DEFAULT TO_VARCHAR(CURRENT_TIMESTAMP(), 'YYYY-MM-DD HH:MI:SS')
 )
 COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
 ;

 --** SSC-FDM-0019 - SEMANTIC INFORMATION COULD NOT BE LOADED FOR TABLE1. CHECK IF THE NAME IS INVALID OR DUPLICATED. **
 CREATE OR REPLACE TABLE TABLE1
 (
  COL0 TIMESTAMP(6) DEFAULT CURRENT_TIMESTAMP() :: TIMESTAMP(6),
  COL1 TIMESTAMP(6) DEFAULT CURRENT_TIME() :: TIMESTAMP(6),
  COL2 TIMESTAMP_LTZ(6) DEFAULT '1900-01-01 12:00:00' :: TIMESTAMP_LTZ(6),
  COL3 TIMESTAMP_TZ(6) DEFAULT '1900-01-01 12:00:00' :: TIMESTAMP_TZ(6),
  COL4 TIMESTAMP(6) WITHOUT TIME ZONE DEFAULT '1900-01-01 12:00:00' :: TIMESTAMP(6) WITHOUT TIME ZONE,
  COL5 TIMESTAMP(6) DEFAULT TO_TIMESTAMP('01/01/1900 12:00:00.000000 AM', 'MM/DD/YYYY HH:MI:SS.FF6 AM') :: TIMESTAMP(6)
  )
 COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
 ;

2.9 Optionen zur gemeinsamen Nutzung und zur Erinnerungsoptimierung

Einige Optionen in Oracle sind in Snowflake nicht erforderlich. Das ist der Fall bei den Optionen sharing und memoptimize, sie werden im Ausgabecode entfernt.

Oracle

CREATE TABLE table1 
    SHARING = METADATA (
     id NUMBER,
     name VARCHAR2(50),
     date DATE,
     CONSTRAINT pk_table PRIMARY KEY (id)
 ) MEMOPTIMIZE FOR READ;

Snowflake

CREATE OR REPLACE TABLE table1 (
     id NUMBER(38, 18) /*** SSC-FDM-0006 - NUMBER TYPE COLUMN MAY NOT BEHAVE SIMILARLY IN SNOWFLAKE. ***/,
     name VARCHAR(50),
     date TIMESTAMP /*** SSC-FDM-OR0042 - DATE TYPE COLUMN HAS A DIFFERENT BEHAVIOR IN SNOWFLAKE. ***/,
     CONSTRAINT pk_table PRIMARY KEY (id)
 )
 COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},"attributes":{"component":"oracle"}}'
 ;

2.10 ASSubQuery

Die folgenden Eigenschaften und Klauseln werden bei der Erstellung einer Tabelle über AS SubQuery in Snowflake nicht unterstützt.

[ immutable_table_clauses ]
[ blockchain_table_clauses ]
[ DEFAULT COLLATION collation_name ]
[ ON COMMIT { DROP | PRESERVE } DEFINITION ]
[ ON COMMIT { DELETE | PRESERVE } ROWS ]
[ physical_properties ]

Oracle

create table table1
-- NO DROP NO DELETE HASHING USING sha2_512 VERSION v1 -- blockchain_clause not yet supported
DEFAULT COLLATION somename
ON COMMIT DROP DEFINITION
ON COMMIT DELETE ROWS
COMPRESS
NOLOGGING
AS
   select
      *
   from
      table1;

Snowflake

CREATE OR REPLACE TABLE table1
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},"attributes":{"component":"oracle"}}'
-- NO DROP NO DELETE HASHING USING sha2_512 VERSION v1 -- blockchain_clause not yet supported
AS
   select
      *
   from
      table1;

Bekannte Probleme

  1. Einige Eigenschaften in den Tabellen müssen möglicherweise angepasst oder kommentiert werden, weil die Verhaltensweise in Snowflake anders ist.