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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. Primary Key Constraints Foreign Key Constraints Related Tasks A table typically has a column or combination of columns that contain values that uniquely identify each row in the table.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.As shown in the following illustration, the Product ID and Vendor ID columns in the Purchasing.
How can I update the foreign keys to make them ON CASCADE UPDATE ?
It is necessary to iterate through each table that has a FK constraint to the PK table.
For each table with the FK: This takes a bit of effort, but would result in your constraint being properly set for your case.
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.
G; COMMIT; END LOOP; CLOSE UPDATE_TEMP_DATE; END; But from last 6 hours it updated only 20,00,000(Twenty lakh) records only.