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    Updating views in oracle

    UPDATE dest_tab tt SET (tt.code, tt.description) = (SELECT st.code, st.description FROM source_tab st WHERE = tt.id) WHERE EXISTS (SELECT 1 FROM source_tab WHERE id = tt.id); 5000 rows updated.SQL ----------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ----------------------------------------------------------------------------------------------- | 0 | UPDATE STATEMENT | | 4999 | 185K| 30013 (34)| | | 1 | UPDATE | dest_tab | | | | | | 2 | NESTED LOOPS SEMI | | 4999 | 185K| 19 (6)| | | 3 | TABLE ACCESS FULL | dest_tab | 10000 | 332K| 18 (0)| | |* 4 | INDEX UNIQUE SCAN | source_tab_PK | 2500 | 10000 | 0 (0)| | | 5 | TABLE ACCESS BY INDEX ROWID| source_tab | 1 | 43 | 2 (0)| | |* 6 | INDEX UNIQUE SCAN | source_tab_PK | 1 | | 1 (0)| | ----------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 4 - access("ID"="TT"."ID") 6 - access("ST"."ID"=: B1) UPDATE (SELECT tt.id, tt.code, tt.description, AS st_code, st.description AS st_description FROM dest_tab tt, source_tab st WHERE = st.id) ilv SET = ilv.st_code, ilv.description = ilv.st_description; 5000 rows updated.Does it mean delete all employees that are in department LCR?Does it mean set to null the dept_code for employees in department LCR? The authors have graciously allowed us to reproduce the contents of the book here.

    At any point in time, a View's data consists of the rows that result if its query definition were evaluated.

    A view is simply any SELECT query that has been given a name and saved in the database.

    For this reason, a view is sometimes called a named query or a stored query.

    For a view to be inherently updatable, the following conditions must be met: CREATE TABLE employee ( employee_no VARCHAR2(8), last_name VARCHAR2(25) NOT NULL, first_name VARCHAR2(10) NOT NULL, dept_code VARCHAR2(3) NOT NULL, active_flag VARCHAR2(1) DEFAULT 'Y', mod_user_id VARCHAR2(30) DEFAULT USER, mod_user_date DATE DEFAULT SYSDATE); CREATE TABLE permission_code ( pcode VARCHAR2(2), pcode_description VARCHAR2(40) NOT NULL, mod_user_id VARCHAR2(30) DEFAULT USER, mod_user_date DATE DEFAULT SYSDATE); CREATE TABLE user_role ( dept_code VARCHAR2(3), pcode VARCHAR2(2), access_level VARCHAR2(1) DEFAULT 'R', mod_user_id VARCHAR2(30) DEFAULT USER, mod_user_date DATE DEFAULT SYSDATE); CREATE TABLE user_permission ( employee_no VARCHAR2(8), pcode VARCHAR2(2), access_level VARCHAR2(1) DEFAULT 'R', mod_user_id VARCHAR2(30) DEFAULT USER, mod_user_date DATE DEFAULT SYSDATE); CREATE TABLE dept_code ( INSERT INTO employee (employee_no, last_name, first_name, dept_code, active_flag) VALUES ('5001', 'Mark', 'Townsend', 'LCR', 'Y'); INSERT INTO employee (employee_no, last_name, first_name, dept_code, active_flag) VALUES ('3996', 'Dacko', 'Carol', 'ESR', 'Y'); INSERT INTO employee (employee_no, last_name, first_name, dept_code, active_flag) VALUES ('6842', 'Morgan', 'Daniel', 'ADM', 'Y'); INSERT INTO permission_code VALUES ('BO', 'BILLING OPTIONS', USER, SYSDATE); INSERT INTO permission_code VALUES ('CL', 'CLASS CODES', USER, SYSDATE); INSERT INTO permission_code VALUES ('CR', 'CREWS', USER, SYSDATE); INSERT INTO permission_code VALUES ('CT', 'CREW TYPES', USER, SYSDATE); INSERT INTO permission_code VALUES ('CU', 'CUSTOMER TYPES', USER, SYSDATE); INSERT INTO permission_code VALUES ('DH', 'WORKORDER DASH NUMBERS', USER, SYSDATE); INSERT INTO dept_code (dept_code, dept_name) VALUES ('ADM', 'ADMINISTRATION'); INSERT INTO dept_code (dept_code, dept_name) VALUES ('COO', 'COORDINATOR'); INSERT INTO dept_code (dept_code, dept_name) VALUES ('ESE', 'ELECTRICAL SERVICE'); INSERT INTO dept_code (dept_code, dept_name) VALUES ('ESR', 'ELECTRICAL SERVICE REP'); INSERT INTO dept_code (dept_code, dept_name) VALUES ('ENG', 'ENGINEER'); INSERT INTO dept_code (dept_code, dept_name) VALUES ('LCR', 'LINE CREW'); INSERT INTO dept_code (dept_code, dept_name) VALUES ('MCR', 'METER CREW'); INSERT INTO dept_code (dept_code, dept_name) VALUES ('NWE', 'NETWORK ENGINEER'); INSERT INTO dept_code (dept_code, dept_name) VALUES ('SKA', 'SKETCH ARTIST'); INSERT INTO user_role (dept_code, pcode, access_level) SELECT r.dept_code, p.pcode, 'R' FROM dept_code r, permission_code p; INSERT INTO user_permission (employee_no, pcode, access_level) SELECT e.employee_no, r.pcode, r.access_level FROM employee e, user_role r WHERE e.dept_code = r.dept_code; COMMIT; CREATE OR REPLACE VIEW role_permission_view AS SELECT r.dept_code, r.pcode, p.pcode_description, r.access_level FROM user_role r, permission_code p WHERE r.pcode = p.pcode; desc role_permission_view col data_type format a15 SELECT column_name, data_type, data_length FROM user_tab_cols WHERE table_name = 'ROLE_PERMISSION_VIEW'; col type format a30 SELECT column_name, , e.dept_code, r.pcode, r.access_level DEFACCLVL, u.access_level, p.pcode_description FROM employee e, user_role r, user_permission u, permission_code p WHERE e.dept_code = r.dept_code AND e.employee_no = u.employee_no AND r.pcode = u.pcode AND r.pcode = p.pcode ORDER BY 1,3; desc employee_permission_view SELECT column_name, ON role_permission_view FOR EACH ROW DECLARE x INTEGER; BEGIN SELECT COUNT(*) INTO x FROM permission_code WHERE pcode = : NEW.pcode; IF x = 0 THEN INSERT INTO permission_code (pcode, pcode_description, mod_user_id, mod_user_date) VALUES (: NEW.pcode, 'New Code', USER, SYSDATE); END IF; SELECT COUNT(*) INTO x FROM dept_code WHERE dept_code = : NEW.dept_code; IF x = 0 THEN INSERT INTO dept_code (dept_code, dept_name) VALUES (: NEW.dept_code, 'New Dept'); END IF; INSERT INTO user_role (dept_code, pcode, mod_user_id) VALUES (: NEW.dept_code, : NEW.pcode, 'Morgan'); INSERT INTO test (test) VALUES ('Z'); END ioft_insert_role_perm; / SELECT * FROM permission_code WHERE pcode = 'DM'; SELECT * FROM dept_code WHERE dept_code = 'DAN'; SELECT * FROM user_role WHERE dept_code = 'DAN'; SELECT * FROM test; ON role_permission_view FOR EACH ROW BEGIN UPDATE user_role SET access_level = : NEW.access_level, mod_user_id = USER, mod_user_date = SYSDATE WHERE dept_code = : OLD.dept_code AND permission_code = : OLD.permission_code; END ioft_role_perm; / SELECT trigger_name, trigger_type, action_type, description FROM user_triggers; SELECT * FROM employee_permission_view; UPDATE role_permission_view SET access_level = 'W' WHERE dept_code = 'SKA'; SELECT * FROM employee_permission_view; UPDATE employee_permission SET access_level = 'Z';/* what does it mean to delete LCR from employee_permission_view?

    Does it mean delete the LCR department from the dept_code table?

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