SnowConvert AI - Oracle - Create Table¶

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

설명¶

Oracle에서 CREATE TABLE 문은 사용자 데이터를 보관하는 기본 구조인 관계형 테이블 또는 열 정의에 데이터 타입을 사용하는 테이블인 오브젝트 테이블 중 한 가지 유형의 테이블을 생성하는 데 사용됩니다. (Oracle 설명서)

Oracle 구문

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 구문

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>' , ... ] ) ]

참고

Snowflake에 대한 자세한 내용은 다음 설명서 를 참조하십시오.

샘플 소스 패턴¶

2.1. 물리적 및 테이블 속성¶

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"}}'
 ;

참고

테이블 속성은 Snowflake에서 마이그레이션한 후에는 필수가 아니므로 제거됩니다.

2.2. 제약 조건 및 제약 상태¶

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)
)
;

참고

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

이 또한 설명이 추가됩니다.

참고

ENABLE 제약 조건 상태는 변환 프로세스 중에 출력 코드에서 완전히 제거됩니다. DISABLE 상태의 경우 NOT NULL 제약 조건과 동시에 제거됩니다.

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. 외래 키¶

전체 자릿수나 스케일이 없는 NUMBER 열이 있는 테이블과 앞서 언급한 NUMBER 열을 참조하는 NUMBER(*,0) 열이 있는 다른 테이블이 있는 경우, 이 외래 키를 설명합니다.

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. 가상 열¶

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. ID 열¶

ID 열의 경우 시퀀스가 생성되어 열에 할당됩니다.

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 및 BLOB 열 선언¶

CLOB 또는 BLOB 으로 선언된 열은 VARCHAR 로 변경됩니다.

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. 제약 조건 이름¶

경고

제약 조건 이름은 Snowflake에 적용되지 않으므로 코드에서 제거되었습니다.

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. 시간이 포함된 기본 열¶

날짜 유형으로 선언된 열은 특정 날짜 유형과 일치하도록 형 변환됩니다.

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"}}'
 ;

2.10 AS SubQuery¶

Snowflake에서 AS SubQuery 를 통해 테이블을 생성할 때 다음 속성 및 절은 지원되지 않습니다.

[ 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;

Known Issues¶

테이블의 일부 속성은 Snowflake의 동작이 다르기 때문에 이에 맞게 조정되거나 설명이 추가될 수 있습니다.

SnowConvert AI - Oracle - Create Table¶

설명¶

샘플 소스 패턴¶

2.1. 물리적 및 테이블 속성¶

Oracle¶

Snowflake¶

2.2. 제약 조건 및 제약 상태¶

CHECK Constraints¶

Example 1: Basic CHECK Constraint¶

Oracle¶

Snowflake¶

Example 2: CHECK Constraint with NOT DEFERRABLE (Removed)¶

Oracle¶

Snowflake¶

Example 3: CHECK Constraint with RELY Clause (Removed)¶

Oracle¶

Snowflake¶

Example 4: CHECK Constraint with Unresolved Function (Unsupported)¶

Oracle¶

Snowflake¶

NOT NULL Constraint States¶

Oracle¶

Snowflake¶

2.3. 외래 키¶

Oracle¶

Snowflake¶

2.4. 가상 열¶

Oracle¶

Snowflake¶

2.5. ID 열¶

Oracle¶

Snowflake¶

2.6. CLOB 및 BLOB 열 선언¶

Oracle¶

Snowflake¶

2.7. 제약 조건 이름¶

Oracle¶

Snowflake¶

2.8. 시간이 포함된 기본 열¶

Oracle¶

Snowflake¶

2.9 공유 및 메모 최적화 옵션¶

Oracle¶

Snowflake¶

2.10 AS SubQuery¶

Oracle¶

Snowflake¶

Known Issues¶

관련 EWIs¶