SnowConvert: Transact 시스템 테이블¶

시스템 테이블¶

Transact-SQL	Snowflake SQL	Notes
SYS.ALL_VIEWS	INFORMATION_SCHEMA.VIEWS
SYS.ALL_COLUMNS	INFORMATION_SCHEMA.COLUMNS
SYS.COLUMNS	INFORMATION_SCHEMA.COLUMNS
SYS.OBJECTS	INFORMATION_SCHEMA.OBJECT_PRIVILEGES
SYS.PROCEDURES	INFORMATION_SCHEMA.PROCEDURES
SYS.SEQUENCES	INFORMATION_SCHEMA.SEQUENCES
SYS.ALL_OBJECTS	INFORMATION_SCHEMA.OBJECT_PRIVILEGES
ALL_PARAMETERS	Not supported
SYS.ALL_SQL_MODULES	Not supported
SYS.ALLOCATION_UNITS	Not supported
SYS.ASSEMBLY_MODULES	Not supported
SYS.CHECK_CONSTRAINTS	Not supported
SYS.COLUMN_STORE_DICTIONARIES	Not supported
SYS.COLUMN_STORE_ROW_GROUPS	Not supported
SYS.COLUMN_STORE_SEGMENTS	Not supported
SYS.COMPUTED_COLUMNS	Not supported
SYS.DEFAULT_CONSTRAINTS	Not supported
SYS.EVENTS	Not supported
SYS.EVENT_NOTIFICATIONS	Not supported
SYS.EVENT_NOTIFICATION_EVENT_TYPES	Not supported
SYS.EXTENDED_PROCEDURES	Not supported
SYS.EXTERNAL_LANGUAGE_FILES	Not supported
SYS.EXTERNAL_LANGUAGES	Not supported
SYS.EXTERNAL_LIBRARIES	Not supported
SYS.EXTERNAL_LIBRARY_FILES	Not supported
SYS.FOREIGN_KEYS	INFORMATION_SCHEMA.TABLE_CONSTRAINTS
SYS.FOREIGN_KEY_COLUMNS	Not supported
SYS.FUNCTION_ORDER_COLUMNS	Not supported
SYS.HASH_INDEXES	Not supported
SYS.INDEXES	Not supported
SYS.INDEX_COLUMNS	Not supported
SYS.INDEX_RESUMABLE_OPERATIONS	Not supported
SYS.INTERNAL_PARTITIONS	Not supported
SYS.INTERNAL_TABLES	Not supported
SYS.KEY_CONSTRAINTS	Not supported
SYS.MASKED_COLUMNS	Not supported
SYS.MEMORY_OPTIMIZED_TABLES_INTERNAL_ATTRIBUTES	Not supported
SYS.MODULE_ASSEMBLY_USAGES	Not supported
SYS.NUMBERED_PROCEDURES	Not supported
SYS.NUMBERED_PROCEDURE_PARAMETERS	Not supported
SYS.PARAMETERS	Not supported
SYS.PARTITIONS	Not supported
SYS.PERIODS	Not supported
SYS.SERVER_ASSEMBLY_MODULES	Not supported
SYS.SERVER_EVENTS	Not supported
SYS.SERVER_EVENTT_NOTIFICATIONS	Not supported
SYS.SERVER_SQL_MODULE	Not supported
SYS.SERVER_TRIGGERS	Not supported
SYS._SERVER_TRIGGER_EVENTS	Not supported
SYS.SQL_DEPENDENCIES	Not supported
SYS.SQL_EXPRESSION_DEPENDENCIES	Not supported
SYS.SQL_MODULES	Not supported
SYS.STATS	Not supported
SYS.STATS_COLUMNS	Not supported
SYS.SYNONYMS	Not supported
SYS.SYSTEM_COLUMNS	Not supported
SYS.SYSTEM_OBJECTS	Not supported
SYS.SYSTEM_PARAMETERS	Not supported
SYS.SYSTEM_SQL_MODULES"	Not supported

알려진 문제 ¶

문제가 발견되지 않았습니다.

SYS.FOREIGN_KEYS¶

Applies to

[x] SQL 서버
[x] Azure 시냅스 분석

참고

출력 코드의 일부 부분은 명확성을 위해 생략되었습니다.

설명¶

오브젝트 당 FOREIGN KEY 제약 조건인 행을 포함합니다(SQLServer 설명서).

FOREIGN KEY (sys.foreign_keys)의 열은 다음과 같습니다.

Column name	Data type	Description	Has equivalent column in Snowflake
<Columns inherited from sys.objects>	-	For a list of columns that this view inherits, see sys.objects (Transact-SQL).	Partial
referenced_object_id	int	ID of the referenced object.	No
key_index_id	int	ID of the key index within the referenced object.	No
is_disabled	bit	FOREIGN KEY constraint is disabled.	No
is_not_for_replication	bit	FOREIGN KEY constraint was created by using the NOT FOR REPLICATION option.	No
is_not_trusted	bit	FOREIGN KEY constraint has not been verified by the system.	No
delete_referential_action	tinyint	The referential action that was declared for this FOREIGN KEY when a delete happens. See SQLServer Documentation.	No
delete_referential_action_desc	nvarchar(60)	Description of the referential action that was declared for this FOREIGN KEY when a delete occurs. See SQLServer Documentation.	No
update_referential_action	tinyint	The referential action that was declared for this FOREIGN KEY when an update happens. See SQLServer Documentation.	No
update_referential_action_desc	nvarchar(60)	Description of the referential action that was declared for this FOREIGN KEY when an update happens. See SQLServer Documentation.	No
is_system_named	bit	1 = Name was generated by the system. 0 = Name was supplied by the user.	No

sys.objects 에서 상속된 열은 다음과 같습니다.

자세한 내용은 sys.objects 설명서 를 참조하십시오.

Column name	Data type	Description	Has equivalent column in Snowflake
name	sysname	Object name.	Yes
object_id	int	Object identification number. Is unique within a database.	No
principal_id	int	ID of the individual owner, if different from the schema owner.	No
schema_id	int	ID of the schema that the object is contained in.	No
parent_object_id	int	ID of the object to which this object belongs.	No
type	char(2)	Object type	Yes
type_desc	nvarchar(60)	Description of the object type	Yes
create_date	datetime	Date the object was created.	Yes
modify_date	datetime	Date the object was last modified by using an ALTER statement.	Yes
is_ms_shipped	bit	Object is created by an internal SQL Server component.	No
is_published	bit	Object is created by an internal SQL Server component.	No
is_schema_published	bit	Only the schema of the object is published.	No

이 경우 sys.foreign_keys의 경우 Snowflake에 동등성이 없다는 점에 유의하십시오. 그러나 동등성은 sys.objects에서 상속된 열에서 기본적으로 생성됩니다.

애플리케이션 열 등가성

SQLServer	Snowflake	Limitations	Applicable
name	CONSTRAINT_NAME	Names auto-generated by the database may be reviewed to the target Snowflake auto-generated name,	Yes
type	CONSTRAINT_TYPE	The type column has a variety of options. But, in this case, the support is only for the letter 'F' which represents the foreign keys.	No. Because of the extra validation to determine the foreign keys from all table constraints, it is not applicable.
type_desc	CONSTRAINT_TYPE	No limitions found.	No. Because of the extra validation to determine the foreign keys from all table constraints, it is not applicable.
create_date	CREATED	Data type differences.	Yes
modify_date	LAST_ALTERED	Data type differences.	Yes
parent_object_id	CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, TABLE_NAME	Columns are generated only for the cases that use the OBJECT_ID() function and, the name has a valid pattern.	Yes

SQL 서버의 구문

 SELECT ('column_name' | * )
FROM sys.foreign_keys;

Copy

Snowflake의 구문

 SELECT ('column_name' | * )
FROM information_schema.table_constraints 
WHERE CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

참고

시스템 외래 키에 대한 등가물은 Snowflake의 카탈로그 뷰에서 ormation_schema.table_constraints이므로, 다른 제약 조건에서 외래 키 제약 조건을 식별하려면 추가 ‘WHERE’ 절에서 제약 조건의 유형을 정의해야 합니다.

샘플 소스 패턴¶

다음 샘플(패턴 번호 3 제외)을 올바르게 수행하려면 다음 문을 실행해야 합니다.

 CREATE TABLE Customers (
    CustomerID INT PRIMARY KEY,
    FirstName VARCHAR(50),
    LastName VARCHAR(50),
    Email VARCHAR(100)
);

CREATE TABLE Orders (
    OrderID INT PRIMARY KEY,
    CustomerID INT,
    OrderDate DATE,
    TotalAmount DECIMAL(10, 2),
    CONSTRAINT FK_Name_Test FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)
);


INSERT INTO Customers (CustomerID, FirstName, LastName, Email)
VALUES
    (1, 'John', 'Doe', 'john.doe@example.com'),
    (2, 'Jane', 'Smith', 'jane.smith@example.com');

INSERT INTO Orders (OrderID, CustomerID, OrderDate, TotalAmount)
VALUES
    (101, 1, '2023-09-01', 100.50),
    (102, 1, '2023-09-02', 75.25),
    (103, 2, '2023-09-03', 50.00);

Copy

 CREATE OR REPLACE TABLE Customers (
    CustomerID INT PRIMARY KEY,
    FirstName VARCHAR(50),
    LastName VARCHAR(50),
    Email VARCHAR(100)
)
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"transact"}}'
;

CREATE OR REPLACE TABLE Orders (
    OrderID INT PRIMARY KEY,
    CustomerID INT,
    OrderDate DATE,
    TotalAmount DECIMAL(10, 2),
       CONSTRAINT FK_Name_Test FOREIGN KEY (CustomerID) REFERENCES Customers (CustomerID)
   )
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"transact"}}'
;

INSERT INTO Customers (CustomerID, FirstName, LastName, Email)
VALUES
    (1, 'John', 'Doe', 'john.doe@example.com'),
    (2, 'Jane', 'Smith', 'jane.smith@example.com');

INSERT INTO Orders (OrderID, CustomerID, OrderDate, TotalAmount)
VALUES
    (101, 1, '2023-09-01', 100.50),
    (102, 1, '2023-09-02', 75.25),
    (103, 2, '2023-09-03', 50.00);

Copy

1. Simple Select Case¶

SQL 서버¶

 SELECT *
FROM sys.foreign_keys;

Copy

name	object_id	principal_id	schema_id	type	type_desc	create_date	modify_date	parent_object_id	is_ms_shipped	is_published	is_schema_published	referenced_object_id	key_index_id	is_disabled	is_not_for_replication	is_not_trusted	delete_referential_action	delete_referential_action_desc	update_referential_action	update_referential_action_desc	is_system_named
FK_Name_Test	1719677174	NULL	1	F	FOREIGN_KEY_CONSTRAINT	2023-09-11 22:20:04.160	2023-09-11 22:20:04.160	1687677060	false	true	false	1655676946	1	false	false		0	NO_ACTION	0	NO_ACTION	true

Snowflake¶

 SELECT *
FROM
INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE	IS_DEFERRABLE	INITIALLY_DEFERRED	ENFORCED	COMMENT	CREATED	LAST_ALTERED	RELY
DBTEST	PUBLIC	FK_Name_Test	DATETEST	PUBLIC	ORDERS	FOREIGN KEY	NO	YES	NO	null	2023-09-11 15:23:51.969 -0700	2023-09-11 15:23:52.097 -0700	NO

경고

열 오브젝트의 차이와 누락된 동등성으로 인해 결과가 달라집니다. 결과를 확인할 수 있습니다.

2. Name Column Case¶

SQL 서버¶

 SELECT * FROM sys.foreign_keys WHERE name = 'FK_Name_Test';

Copy

name	object_id	principal_id	schema_id	type	type_desc	create_date	modify_date	parent_object_id	is_ms_shipped	is_published	is_schema_published	referenced_object_id	key_index_id	is_disabled	is_not_for_replication	is_not_trusted	delete_referential_action	delete_referential_action_desc	update_referential_action	update_referential_action_desc	is_system_named
FK_Name_Test	1719677174	NULL	1	F	FOREIGN_KEY_CONSTRAINT	2023-09-11 22:20:04.160	2023-09-11 22:20:04.160	1687677060	false	true	false	1655676946	1	false	false		0	NO_ACTION	0	NO_ACTION	true

Snowflake¶

 SELECT * FROM
INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
CONSTRAINT_NAME = 'FK_NAME_TEST'
AND CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE	IS_DEFERRABLE	INITIALLY_DEFERRED	ENFORCED	COMMENT	CREATED	LAST_ALTERED	RELY
DBTEST	PUBLIC	FK_Name_Test	DATETEST	PUBLIC	ORDERS	FOREIGN KEY	NO	YES	NO	null	2023-09-11 15:23:51.969 -0700	2023-09-11 15:23:52.097 -0700	NO

경고

제약 조건 이름이 데이터베이스에 의해 자동 생성되어 쿼리에 사용되는 경우 이 변환은 확인이 필요할 수 있습니다. 자세한 내용은 [문제 파악](./transact-system-tables.md#1-the-name-column-may-not-show-a-correct-output-if-the-constraint-does-not- have-a-user-created-name) 섹션을 검토하십시오.

3. Parent Object ID Case¶

이 예제에서는 서로 다른 동등한 열을 생성하기 위한 이름 처리의 예시를 보여주기 위해 데이터베이스와 스키마를 생성했습니다.

SQL 서버¶

 use database_name_test
create schema schema_name_test

CREATE TABLE schema_name_test.Customers (
    CustomerID INT PRIMARY KEY,
    FirstName VARCHAR(50),
    LastName VARCHAR(50),
    Email VARCHAR(100)
);

CREATE TABLE schema_name_test.Orders (
    OrderID INT PRIMARY KEY,
    CustomerID INT,
    OrderDate DATE,
    TotalAmount DECIMAL(10, 2),
    CONSTRAINT FK_Name_Test FOREIGN KEY (CustomerID) REFERENCES schema_name_test.Customers(CustomerID)
);

INSERT INTO schema_name_test.Customers (CustomerID, FirstName, LastName, Email)
VALUES
    (1, 'John', 'Doe', 'john.doe@example.com'),
    (2, 'Jane', 'Smith', 'jane.smith@example.com');

INSERT INTO schema_name_test.Orders (OrderID, CustomerID, OrderDate, TotalAmount)
VALUES
    (101, 1, '2023-09-01', 100.50),
    (102, 1, '2023-09-02', 75.25),
    (103, 2, '2023-09-03', 50.00);

SELECT * FROM sys.foreign_keys WHERE name = 'FK_Name_Test' AND parent_object_id = OBJECT_ID(N'database_name_test.schema_name_test.Orders')

Copy

name	object_id	principal_id	schema_id	type	type_desc	create_date	modify_date	parent_object_id	is_ms_shipped	is_published	is_schema_published	referenced_object_id	key_index_id	is_disabled	is_not_for_replication	is_not_trusted	delete_referential_action	delete_referential_action_desc	update_referential_action	update_referential_action_desc	is_system_named
FK_Name_Test	1719677174	NULL	1	F	FOREIGN_KEY_CONSTRAINT	2023-09-11 22:20:04.160	2023-09-11 22:20:04.160	1687677060	false	true	false	1655676946	1	false	false		0	NO_ACTION	0	NO_ACTION	true

Snowflake¶

 USE DATABASE database_name_test;

CREATE OR REPLACE SCHEMA schema_name_test
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},"attributes":{"component":"transact"}}'
;

CREATE OR REPLACE TABLE schema_name_test.Customers (
    CustomerID INT PRIMARY KEY,
    FirstName VARCHAR(50),
    LastName VARCHAR(50),
    Email VARCHAR(100)
)
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},"attributes":{"component":"transact"}}'
;

CREATE OR REPLACE TABLE schema_name_test.Orders (
    OrderID INT PRIMARY KEY,
    CustomerID INT,
    OrderDate DATE,
    TotalAmount DECIMAL(10, 2),
       CONSTRAINT FK_Name_Test FOREIGN KEY (CustomerID) REFERENCES schema_name_test.Customers (CustomerID)
   )
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},"attributes":{"component":"transact"}}'
;

INSERT INTO schema_name_test.Customers (CustomerID, FirstName, LastName, Email)
VALUES
    (1, 'John', 'Doe', 'john.doe@example.com'),
    (2, 'Jane', 'Smith', 'jane.smith@example.com');

INSERT INTO schema_name_test.Orders (OrderID, CustomerID, OrderDate, TotalAmount)
VALUES
    (101, 1, '2023-09-01', 100.50),
    (102, 1, '2023-09-02', 75.25),
    (103, 2, '2023-09-03', 50.00);

SELECT * FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
    CONSTRAINT_NAME = 'FK_NAME_TEST'
    AND CONSTRAINT_CATALOG = 'DATABASE_NAME_TEST'
    AND CONSTRAINT_SCHEMA = 'SCHEMA_NAME_TEST'
    AND TABLE_NAME = 'ORDERS'
    AND CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE	IS_DEFERRABLE	INITIALLY_DEFERRED	ENFORCED	COMMENT	CREATED	LAST_ALTERED	RELY
DATABASE_NAME_TEST	SCHEMA_NAME_TEST	FK_Name_Test	DATABASE_NAME_TEST	SCHEMA_NAME_TEST	ORDERS	FOREIGN KEY	NO	YES	NO	null	2023-09-11 15:23:51.969 -0700	2023-09-11 15:23:52.097 -0700	NO

경고

OBJECT_ID() 함수 안에 오는 이름에 유효한 패턴이 없는 경우 특수 문자에 대한 이름 처리 제한으로 인해 변환되지 않습니다.

경고

Snowflake에서 사용 중인 데이터베이스를 검토합니다.

4. Type Column Case¶

SQL 서버의 ‘F’는 ‘외래 키’를 의미하며, 모든 테이블 제약 조건에서 외래 키를 지정하기 위해 마지막에 유효성 검사로 인해 제거됩니다.

SQL 서버¶

 SELECT * FROM sys.foreign_keys WHERE type = 'F';

Copy

name	object_id	principal_id	schema_id	type	type_desc	create_date	modify_date	parent_object_id	is_ms_shipped	is_published	is_schema_published	referenced_object_id	key_index_id	is_disabled	is_not_for_replication	is_not_trusted	delete_referential_action	delete_referential_action_desc	update_referential_action	update_referential_action_desc	is_system_named
FK_Name_Test	1719677174	NULL	3	F	FOREIGN_KEY_CONSTRAINT	2023-09-11 22:20:04.160	2023-09-11 22:20:04.160	1687677060	false	true	false	1655676946	1	false	false		0	NO_ACTION	0	NO_ACTION	true

Snowflake¶

 SELECT * FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
    type = 'F' AND CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE	IS_DEFERRABLE	INITIALLY_DEFERRED	ENFORCED	COMMENT	CREATED	LAST_ALTERED	RELY
DBTEST	PUBLIC	FK_Name_Test	DATETEST	PUBLIC	ORDERS	FOREIGN KEY	NO	YES	NO	null	2023-09-11 15:23:51.969 -0700	2023-09-11 15:23:52.097 -0700	NO

5. Type Desc Column Case¶

‘type_desc’ 열은 모든 테이블 제약 조건에서 외래 키를 지정하기 위해 끝 부분의 유효성 검사로 인해 제거됩니다.

SQL 서버¶

 SELECT
    * 
FROM
    sys.foreign_keys 
WHERE 
    type_desc = 'FOREIGN_KEY_CONSTRAINT';

Copy

name	object_id	principal_id	schema_id	type	type_desc	create_date	modify_date	parent_object_id	is_ms_shipped	is_published	is_schema_published	referenced_object_id	key_index_id	is_disabled	is_not_for_replication	is_not_trusted	delete_referential_action	delete_referential_action_desc	update_referential_action	update_referential_action_desc	is_system_named
FK_Name_Test	1719677174	NULL	3	F	FOREIGN_KEY_CONSTRAINT	2023-09-11 22:20:04.160	2023-09-11 22:20:04.160	1687677060	false	true	false	1655676946	1	false	false		0	NO_ACTION	0	NO_ACTION	true

Snowflake¶

 SELECT
    *
FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
    type_desc = 'FOREIGN_KEY_CONSTRAINT' AND CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE	IS_DEFERRABLE	INITIALLY_DEFERRED	ENFORCED	COMMENT	CREATED	LAST_ALTERED	RELY
DBTEST	PUBLIC	FK_Name_Test	DATETEST	PUBLIC	ORDERS	FOREIGN KEY	NO	YES	NO	null	2023-09-11 15:23:51.969 -0700	2023-09-11 15:23:52.097 -0700	NO

6. Modify Date Column Simple Case¶

SQL 서버¶

 SELECT *
FROM sys.foreign_keys
WHERE modify_date = CURRENT_TIMESTAMP;

Copy

The query produced no results.

Copy

Snowflake¶

 SELECT *
FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
    LAST_ALTERED = CURRENT_TIMESTAMP()
    AND CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

The query produced no results.

Copy

7. Modify Date Column with DATEDIFF() Case¶

다음 예제에서는 sys.foreign_keys(sys.objects에서 상속된)의 열이 DATEDIFF 함수의 내부에 있는 보다 복잡한 시나리오를 보여줍니다. 이 경우 해당 등가물에 해당하는 인자는 Snowflake의 Information Schema에서 해당 열로 변경됩니다.

SQL 서버¶

 SELECT *
FROM sys.foreign_keys
WHERE DATEDIFF(DAY, modify_date, GETDATE()) <= 30;

Copy

The foreign keys altered in the last 30 days.

Copy

Snowflake¶

 SELECT *
FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
    DATEDIFF(DAY, LAST_ALTERED, CURRENT_TIMESTAMP() :: TIMESTAMP) <= 30
    AND CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

The foreign keys altered in the last 30 days.

Copy

8. Create Date Column Case¶

SQL 서버¶

 SELECT *
FROM sys.foreign_keys
WHERE create_date = '2023-09-12 14:36:38.060';

Copy

The foreign keys that were created on the specified date and time.

Copy

Snowflake¶

 SELECT *
FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
    CREATED = '2023-09-12 14:36:38.060'
    AND CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

The foreign keys that were created on the specified date and time.

Copy

경고

쿼리가 실행된 시간으로 인해 생성 날짜가 특정할 경우 결과가 변경될 수 있습니다. 원본 데이터베이스에서 지정된 쿼리를 한 번에 실행한 다음 새로운 Snowflake 쿼리에서 오브젝트를 다른 시간에 실행할 수 있습니다.

9. Selected Columns Single Name Case¶

SQL 서버¶

 SELECT name
FROM sys.foreign_keys;

Copy

이름
FK_Name_Test

Snowflake¶

 SELECT
    CONSTRAINT_NAME
FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
    CONSTRAINT_TYPE = 'FOREIGN KEY';

Copy

CONSTRAINT_NAME
FK_Name_Test

10. Selected Columns Qualified Name Case¶

SQL 서버¶

 SELECT
    fk.name
FROM sys.foreign_keys AS fk;

Copy

이름
FK_Name_Test

Snowflake¶

 SELECT
    fk.CONSTRAINT_NAME
FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS fk
WHERE
    CONSTRAINT_TYPE = 'FOREIGN KEY';

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CONSTRAINT_NAME
FK_Name_Test

Known Issues¶

1. The ‘name’ column may not show a correct output if the constraint does not have a user-created name¶

참조된 이름이 데이터베이스에서 자동 생성된 이름인 경우 이를 검토하여 원하는 값을 사용할 가능성이 높습니다.

2. When selecting columns, there is a limitation that depends on the applicable columns that are equivalent in Snowflake¶

Sys.foreign_keys의 열은 Snowflake에서 완전히 동일하지 않으므로 동등성 제한으로 인해 일부 결과가 변경될 수 있습니다.

3. The OBJECT_ID() function may have a valid pattern to be processed or the database, schema or table could not be extracted¶

OBJECT_ID() 함수를 수신하는 이름에 따라 이 이름의 처리는 형식에 따라 제한되고 종속성을 갖습니다.

4. Name Column With OBJECT_NAME() Function Case¶

OBJECT_NAME() 함수는 아직 지원되지 않으므로 이 함수와 관련된 변환은 지원되지 않습니다.

 SELECT name AS ForeignKeyName,
       OBJECT_NAME(parent_object_id) AS ReferencingTable,
       OBJECT_NAME(referenced_object_id) AS ReferencedTable
FROM sys.foreign_keys;

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 SELECT
    name AS ForeignKeyName,
    !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'OBJECT_NAME' NODE ***/!!!
    OBJECT_NAME(parent_object_id) AS ReferencingTable,
    !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'OBJECT_NAME' NODE ***/!!!
    OBJECT_NAME(referenced_object_id) AS ReferencedTable
FROM
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE
    CONSTRAINT_TYPE = 'FOREIGN KEY';

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SnowConvert: Transact 시스템 테이블¶

시스템 테이블¶

알려진 문제 ¶

관련 EWIs¶

SYS.FOREIGN_KEYS¶

설명¶

애플리케이션 열 등가성

SQL 서버의 구문

Snowflake의 구문

샘플 소스 패턴¶

1. Simple Select Case¶

SQL 서버¶

Snowflake¶

2. Name Column Case¶

SQL 서버¶

Snowflake¶

3. Parent Object ID Case¶

SQL 서버¶

Snowflake¶

4. Type Column Case¶

SQL 서버¶

Snowflake¶

5. Type Desc Column Case¶

SQL 서버¶

Snowflake¶

6. Modify Date Column Simple Case¶

SQL 서버¶

Snowflake¶

7. Modify Date Column with DATEDIFF() Case¶

SQL 서버¶

Snowflake¶

8. Create Date Column Case¶

SQL 서버¶

Snowflake¶

9. Selected Columns Single Name Case¶

SQL 서버¶

Snowflake¶

10. Selected Columns Qualified Name Case¶

SQL 서버¶

Snowflake¶

Known Issues¶

1. The ‘name’ column may not show a correct output if the constraint does not have a user-created name¶

2. When selecting columns, there is a limitation that depends on the applicable columns that are equivalent in Snowflake¶

3. The OBJECT_ID() function may have a valid pattern to be processed or the database, schema or table could not be extracted¶

4. Name Column With OBJECT_NAME() Function Case¶

5. SCHEMA_NAME() and TYPE_NAME() functions are also not supported yet.¶

6. Different Join statement types may be not supported if the system table is not supported.¶

7. Cases with JOIN statements are not supported.¶

8. Names with alias AS are not supported.¶

관련 EWIs¶