Which of the following is not a valid constraint?
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1. Which of the following is not a valid constraint?
a. PRIMARY KEY
b. FOREIGN KEY
c. CHECK
d. UNIQUE
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- Which of the following types of constraints cant be created at the table level? a. NOT NULL b. PRIMARY KEY c. CHECK d. FOREIGN KEY e. None of the above constraints can be created at the table level.What is the difference between disabling a constraint and dropping a constraint?Which of the following commands can you use to rename a constraint? RENAME ALTER CONSTRAINT MOVE NEW NAME None of the above commands can be used.
- Which 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.What happens when a constraint is followed? Unique I Primary Key (ii), Default (iii), and Check (iv) Unique I Primary Key (ii), Default (iii), and Check (iv)Oracle 12c automatically creates an index for which type of constraints?a. NOT NULLb. PRIMARY KEYc. FOREIGN KEYd. UNIQUE KEYe. none of the abovef. only a and bg. only b and d
- Name Null? Type --------- ----- ------------ GIFT VARCHAR2(15) MINRETAIL NUMBER(5,2) MAXRETAIL NUMBER(5,2) Based on the structure of the PROMOTION table, which of the following commands will add a PRIMARY KEY constraint to the GIFT column? 1. CREATE constraint promo_pk (gift VARCHAR2(15) PRIMARY KEY; 2. ALTER TABLE promotion MODIFY constraint promo_pk (gift PRIMARY KEY); 3. ALTER TABLE promotion SET constraint promo_pk PRIMARY KEY gift; 4. ALTER TABLE promotion ADD constraint promo_pk PRIMARY KEY(gift);Which of the following is not a valid constraint type? ( refer to the tables in the JustLee Books database). a. PRIMARY KEYS b. UNIQUE c. CHECK d. FOREIGN KEYWhich of the following types of constraints can’t be created at the table level? ( refer to the tables in the JustLee Books database). a. NOT NULL b. PRIMARY KEY c. CHECK d. FOREIGN KEY e. None of the above constraints can be created at the table level
- What is the process of following a constraint? I Unique (ii) Primary Key (iii) Default (iv) Check? I Unique (ii) Primary Key (iii) Default (iv) Check?Which of the following is a type of constraint? Creating a table Naming the columns Declaring a data type Naming the tableYou issue the following command: INSERT INTO homework10 (col1, col2, col3) VALUES (‘A’, NULL, ‘C’). The command will fail if which of the following statements is true?a. Col1 has a PRIMARY KEY constraint enabled.b. Col2 has a UNIQUE constraint enabled.c. Col3 is defined as a DATE column.d. None of the above would cause the command to fail.