While updating records using cursor diana taurasi dating penny taylor

02 Feb

When you use a Transact-SQL server cursor, you can update the current row by using an UPDATE statement that includes a WHERE CURRENT OF clause.

Changes made with this clause affect only the row on which the cursor is positioned. Business Entity ID) ; OPEN complex_cursor; FETCH FROM complex_cursor; UPDATE Human Resources.

Then, I tried the same thing with one of primary key disabled in the WHERE clause of the plsql.

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You can make things a little more obvious by explicitly stating that the cursor is to be used for updating, as shown below: This cursor can be used to update any field from the underlying data set.

You use the CREATE TABLE employees_temp AS SELECT employee_id, first_name FROM employees; CREATE TABLE employees_temp2 AS SELECT employee_id, first_name FROM employees; DECLARE next_value NUMBER; BEGIN -- The NEXTVAL value is the same no matter what table you select from. NEXTVAL INTO next_value FROM dual; -- You usually use NEXTVAL to create unique numbers when inserting data. NEXTVAL, 'value 1'); -- If you need to store the same value somewhere else, you use CURRVAL. CURRVAL, 'value 1'); -- Because NEXTVAL values might be referenced by different users and -- applications, and some NEXTVAL values might not be stored in the -- database, there might be gaps in the sequence.

END; / DROP TABLE employees_temp; DROP TABLE employees_temp2; statement to organize rows from a database table into a tree structure.

Consider the following table: Here is how you use the Update Cursor.

I have highlighted the areas which differ compared with a normal cursor.