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- Which of the following is a correct statement? a. A commit is issued implicitly when a user exits SQL Developer or SQLPlus. b. A commit is issued implicitly when a DDL command is executed. c. A commit is issued automatically when a DML command is executed. d. All of the above are correct. e. Both a and b are correct. f. Both a and c are correct.Which of the following is a valid SQL statement? SELECT * WHERE amid = ‘J100’ FOR UPDATE; INSERT INTO homeworkl0 VALUES (SELECT * FROM acctmanager); DELETE amid FROM acctmanager; rollback; all of the aboveWhich of the following SQL statements is invalid and returns an error message? ALTER TABLE books ADD CONSTRAINT books_pubid_uk UNIQUE (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_pk PRIMARY KEY (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_nn NOT NULL (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid); All of the above statements are invalid.
- Which of the following is not a valid SQL statement? CREATE TABLE anothernewtable (newtableid VARCHAR2 (2)); CREATE TABLE anothernewtable (date, anotherdate) AS (SELECT orderdate, shipdate FROM orders); CREATE TABLE anothernewtable (firstdate, seconddate) AS (SELECT orderdate, shipdate FROM orders); All of the above are valid statements.Which of the following is a valid SQL statement? (refer to the tables in the JustLee Books database.)a. SELECT customer#, order#, MAX(shipdate-orderdate)FROM ordersGROUP BY customer#WHERE customer# = 1001;b. SELECT customer#, COUNT(order#)FROM ordersGROUP BY customer#;c. SELECT customer#, COUNT(order#)FROM ordersGROUP BY COUNT(order#);d. SELECT customer#, COUNT(order#)FROM ordersGROUP BY order#;Which of the following SQL statements is valid? a. INSERT INTO table_name (val1, val2); b. ALTER COLUMN column_name SET PRIMARY KEY; c. INSERT INTO table_name1 SELECT col1, col2 FROM table_name2; d. SLTER TABLE table_name SET col1 PRIMARY KEY; e. All of the above. f. None of the above.