Preventing Duplicate Entry For A Given Foreign Key In Db Table
Hi,i am using SQL server 2005 and have a table with 4 columns.Column1 is primary key,col2 is foreign key and col3 and col4 are regular data column.When the user enters the data i want to make sure that for a given foreign key(col2),entries in col3 are not duplicated.Is there a way,i can make sure this at db level,using some kind of constraints or something?Thanks a bunch..
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Foreign Key References Invalid Table
Hey. I'm trying to create some tables in my database but I'm getting some errors... The one which is causing the most trouble is Msg 1767, Level 16, State 0, Line 38 Foreign key 'ten_fk' references invalid table 'Tenant'. I'm not sure why it's complaining... can anyone help me out here? Cheers! -- Mitch Curtis -- A2create.sql -- Set the active database to KWEA. USE KWEA; -- Drop existing tables (if any). DROP TABLE Ownership; DROP TABLE Tenant; DROP TABLE Staff; DROP TABLE Property; DROP TABLE Property_Status_Report; DROP TABLE Property_Owner; DROP TABLE Placement_Record; DROP TABLE Candidate_Tenant; DROP TABLE Waiting_List; -- Create new tables. CREATE TABLE Waiting_List ( waiting# INT IDENTITY(1,1) PRIMARY KEY NOT NULL, candidate_name VARCHAR(20) NOT NULL, anticipated_start_date SMALLDATETIME NULL, anticipated_end_date SMALLDATETIME NULL, max_affordable_rent SMALLMONEY NOT NULL ); CREATE TABLE Candidate_Tenant ( candidate# INT IDENTITY(1,1) PRIMARY KEY NOT NULL, waiting# INT NULL, name VARCHAR(20) NOT NULL, phone_number INT NOT NULL, required_property_type VARCHAR(10) NOT NULL, CONSTRAINT w_fk FOREIGN KEY(waiting#) REFERENCES Waiting_List(waiting#) ); CREATE TABLE Placement_Record ( opening# INT IDENTITY(1,1) PRIMARY KEY NOT NULL, tenant# INT NOT NULL, start_date SMALLDATETIME NOT NULL, end_date SMALLDATETIME NOT NULL, total_bonds SMALLMONEY NOT NULL, weekly_rent SMALLMONEY NOT NULL, CONSTRAINT ten_fk FOREIGN KEY(tenant#) REFERENCES Tenant(tenant#) ); CREATE TABLE Property_Owner ( owner# INT IDENTITY(1,1) PRIMARY KEY NOT NULL, name VARCHAR(20) NOT NULL, phone_number INT NOT NULL ); CREATE TABLE Property_Status_Report ( address VARCHAR(30) NOT NULL, report_date SMALLDATETIME NOT NULL, weekly_rent SMALLMONEY NOT NULL, month_rent_start_date SMALLDATETIME NOT NULL, month_rent_end_date SMALLDATETIME NOT NULL, maintenance_fee SMALLMONEY NOT NULL, month_inspection_history VARCHAR(30) NULL, CONSTRAINT ar_pk PRIMARY KEY(address, report_date), FOREIGN KEY(address) REFERENCES Property(address) ); CREATE TABLE Property ( address VARCHAR(30) PRIMARY KEY NOT NULL, staff# INT IDENTITY(1,1) NOT NULL, type VARCHAR NOT NULL, occupant_limit INT NOT NULL, comments VARCHAR(30) NULL, FOREIGN KEY(staff#) REFERENCES Staff(staff#) ); CREATE TABLE Staff ( staff# INT IDENTITY(1,1) PRIMARY KEY NOT NULL, manager# INT NOT NULL, name VARCHAR(20) NOT NULL, FOREIGN KEY(manager#) REFERENCES Staff(staff#) ); CREATE TABLE Tenant ( tenant# INT IDENTITY(1,1) PRIMARY KEY NOT NULL, staff# INT NOT NULL, property_address VARCHAR(30) NOT NULL, name VARCHAR(20) NOT NULL, phone_number INT NOT NULL, street VARCHAR(20) NOT NULL, city VARCHAR(20) NOT NULL, postcode INT NOT NULL, category VARCHAR(10) NOT NULL, comments VARCHAR(30) NULL, FOREIGN KEY(staff#) REFERENCES Staff(staff#), FOREIGN KEY(property_address) REFERENCES Property(address) ); CREATE TABLE Ownership ( address VARCHAR(30) NOT NULL, owner# INT NOT NULL, CONSTRAINT ao_pk PRIMARY KEY(address, owner#), FOREIGN KEY(address) REFERENCES Property(address), FOREIGN KEY(owner#) REFERENCES Property_Owner(owner#) ); -- Display tables. SELECT * FROM Waiting_List; SELECT * FROM Candidate_Tenant; SELECT * FROM Placement_Record; SELECT * FROM Property_Owner; SELECT * FROM Property_Status_Report; SELECT * FROM Property; SELECT * FROM Staff; SELECT * FROM Tenant; SELECT * FROM Ownership; Errors: Msg 3701, Level 11, State 5, Line 8 Cannot drop the table 'Ownership', because it does not exist or you do not have permission. Msg 3701, Level 11, State 5, Line 9 Cannot drop the table 'Tenant', because it does not exist or you do not have permission. Msg 3701, Level 11, State 5, Line 10 Cannot drop the table 'Staff', because it does not exist or you do not have permission. Msg 3701, Level 11, State 5, Line 11 Cannot drop the table 'Property', because it does not exist or you do not have permission. Msg 3701, Level 11, State 5, Line 12 Cannot drop the table 'Property_Status_Report', because it does not exist or you do not have permission. Msg 3701, Level 11, State 5, Line 13 Cannot drop the table 'Property_Owner', because it does not exist or you do not have permission. Msg 3701, Level 11, State 5, Line 14 Cannot drop the table 'Placement_Record', because it does not exist or you do not have permission. Msg 1767, Level 16, State 0, Line 38 Foreign key 'ten_fk' references invalid table 'Tenant'. Msg 1750, Level 16, State 0, Line 38 Could not create constraint. See previous errors.
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Lookup Table Foreign Key Null
I'm using SQL Server 2000. I have an EXTERNAL_FUNDING table and an EXTERNAL_FUNDING_TYPE table. The DDL for the tables is listed below. Each EXTERNAL_FUNDING record has a type field, which is a foreign key to a record in the EXTERNAL_FUNDING_TYPE table. However, I would like for the type to be allowed to be null. When displaying the data, if the type is null, I'd like to show blank text. Here is the query I'm trying to use: SELECT EXTERNAL_FUNDING.id, date_requested as [Request Date],source as [Source/Sponsor],EXTERNAL_FUNDING_TYPE.type AS [Type],amount as [Amount], granted as [Granted] FROM EXTERNAL_FUNDING,EXTERNAL_FUNDING_TYPE WHERE (project_id = @project_id) AND (EXTERNAL_FUNDING.type = EXTERNAL_FUNDING_TYPE.id) ORDER BY date_requested ,source,type But this query does not return the records with NULL for the type field. Can someone explain to me how I can also return the rows with a NULL type? Thanks! Table DDL: CREATE TABLE [dbo].[EXTERNAL_FUNDING] ( [id] [int] IDENTITY (1, 1) NOT NULL , [project_id] [int] NOT NULL , [date_requested] [datetime] NULL , [source] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL , [type] [int] NULL , [amount] [money] NULL , [granted] [bit] NULL , [date_granted] [datetime] NULL ) ON [PRIMARY] CREATE TABLE [dbo].[EXTERNAL_FUNDING_TYPE] ( [type] [nvarchar] (30) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL , [id] [int] IDENTITY (1, 1) NOT NULL ) ON [PRIMARY]
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Foreign Key From Another Table In A Linked Server
Hi, We're having a few linked servers in our company. some tables in one of the linked servers include columns (better saying, foreign keys) of tables in another server. I wonder if there's a way to create a foreign key referencing one column in another server. That is, suppose there's Column A in table A in Server A which references Column B in table B in server B, is there a way to create column A as foreign key referencing column B? Any idea is appreciated.
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Foreign Key From Another Table In A Linked Server
Hi, We're having a few linked servers in our company. some tables in one of the linked servers include columns (better saying, foreign keys) of tables in another server. I wonder if there's a way to create a foreign key referencing one columns in another server. That is, suppose there's Column A in table A in Server A which references Column B in table B in server B, is there a way to create column A as foreign key referencing column B? Any idea is appreciated.
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How To Automatically Create New Records In A Foreign Table When Inserting Records In A Primary Table.
Ok, I'm really new at this, but I am looking for a way to automatically insert new records into tables. I have one primary table with a primary key id that is automatically generated on insert and 3 other tables that have foreign keys pointing to the primary key. Is there a way to automatically create new records in the foreign tables that will have the new id? Would this be a job for a trigger, stored procedure? I admit I haven't studied up on those yet--I am learning things as I need them. Thanks.
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&&"Cannot Truncate Table 'Database.dbo.Table' Because It Is Being Referenced By A FOREIGN KEY Constraint.&&".
Here is my issue I am new to 2005 sql server, and am trying to take my old data which is exported to a txt file and import it to tables in sql. The older database is non relational, and I had made several exports for the way I want to build my tables. I built my packages fine and everything is working until I start building relationships. I remove my foreign key and the table with the primary key will get updated for the package again. I need to update the data daily into sql, and once in it will only be update from the package until the database is moved over. It will run and update with a primary key until I add a foreign key to another database. Here is my error when running the package when table 2 has a foreign key. [Execute SQL Task] Error: Executing the query "TRUNCATE TABLE [consumer].[dbo].[Client] " failed with the following error: "Cannot truncate table 'consumer.dbo.Client' because it is being referenced by a FOREIGN KEY constraint.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
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Insert Records Into A Table With Foreign Keys
i'm using sql express, management studio express and a visual web developer starter kit. i have 4 tables: items; categories; categorization; old_items the old_items table has both the item id and category fields in it, the new db has them separated: items.id; categories.id; categorization.itemId, categorizaton.parentCategoryId, both of which are foreign keys. i need to get the old_item.id and old_item.category values into the new categorization table but it keeps choking on the foreign keys and i can't get past it. as far as i've been able to figure out so far, i need to turn off the foreign keys to do the insert but i'm not sure and i haven't been able to find any sql query examples that demonstrate it or explain it well enough for my n00b self. i've read http://msdn.microsoft.com/en-us/library/10cetyt6.aspx, "How to: Disable Foreign Key Constraints with INSERT and UPDATE Statements" but i don't get how that affects it, it seems like one of the other options would actually disable them. can anyone help? i've been trying all the permutations of queries i can think of and not getting it. thanks.
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