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PL/SQL also conforms to the current ANSI/ISO SQL standard.
In addition to static SQL discussed in this chapter, PL/SQL also supports dynamic SQL, which enables you to execute SQL data definition, data control, and session control statements dynamically.
You give the cursor a name and associate it with a specific query.
You can optionally declare a return type for the cursor, such as DECLARE my_emp_id NUMBER(6); -- variable for employee_id my_job_id VARCHAR2(10); -- variable for job_id my_sal NUMBER(8,2); -- variable for salary CURSOR c1 IS SELECT employee_id, job_id, salary FROM employees WHERE salary The cursor is not a PL/SQL variable: you cannot assign values to a cursor or use it in an expression.
PUT_LINE('Number of employees deleted: '
You might use sequence numbers to give each row a unique identifier, and refer to those identifiers from other rows to set up parent-child relationships. PL/SQL declares a cursor implicitly for all SQL data manipulation statements, including queries that return only one row.After creating a sequence, you can use it to generate unique sequence numbers for transaction processing. PUT_LINE ('Initial sequence value: '