Updating primary key


29-Jun-2020 03:12

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By creating this foreign key relationship, a value for Sales Person ID cannot be inserted into the Sales Order Header table if it does not already exist in the Sales Person table.A table can reference a maximum of 253 other tables and columns as foreign keys (outgoing references).Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Sign up to join this community , I see that update_referential_action is set to 0.I have a table with two columns, both of which make up the primary key.I want the user to be able to update Column2, and to only see relevant records.E., DO -2 TO EXISTING START DATE) AND SELECTED ALL THE ELIGIBLE RECORDS INTO THIS AND TABLE AND CREATED UNIQUE INDEX ON IT. Count of Tables : TEMP_WED_TO_MONDAY is 46,921,912 and total table count is 48052365 DECLARE CURSOR UPDATE_TEMP_DATE IS SELECT A, B, C, D, E, F, G, E - 2 NEW_E FROM TEMP_WED_TO_MOONDAY; TYPE UPDATE_TEMP_DATE_REC IS RECORD ( A VARCHAR2 (50 CHAR), B VARCHAR2 (50 CHAR), C VARCHAR2 (50 CHAR), D VARCHAR2 (18 CHAR), E DATE, F NUMBER, G VARCHAR2 (50 CHAR), NEW_E DATE ); TYPE UPDATE_TEMP_DATE_TBL_TYPE IS TABLE OF UPDATE_TEMP_DATE_REC; UPDATE_TEMP_DATE_TBL UPDATE_TEMP_DATE_TBL_TYPE; BEGIN OPEN UPDATE_TEMP_DATE; LOOP FETCH UPDATE_TEMP_DATE BULK COLLECT INTO UPDATE_TEMP_DATE_TBL LIMIT 1000000; EXIT WHEN UPDATE_TEMP_DATE_TBL.

You should be able to work from that to make only the changes that you want in your database. Here's a small how-to: Basically, when you modify the PK, the cascade will go out and update all the FKs that reference it.

This column becomes a foreign key in the second table. Sales Order Header table has a foreign key link to the Sales.

Sales Person table because there is a logical relationship between sales orders and salespeople.

SQL Server 2016 (13.x) increases the limit for the number of other table and columns that can reference columns in a single table (incoming references), from 253 to 10,000.

(Requires at least 130 compatibility level.) The increase has the following restrictions: Unlike primary key constraints, creating a foreign key constraint does not automatically create a corresponding index.

Primary keys and foreign keys are two types of constraints that can be used to enforce data integrity in SQL Server tables. This column, or columns, is called the primary key (PK) of the table and enforces the entity integrity of the table.