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单选题
Table TAB1 was created using the following statement: CREATE TABLE tab1 (c1 INT, c2 INT, c3 INT, c4 INT, c5 INT); If column C1 is unique and queries typically access columns C1 and C2 together, which statement(s) will create index(es) that will provide optimal query performance? （）
A
CREATE UNIQUE INDEX xtab1 ON tab1 (c1) include (c2)
B
CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c3) INCLUDE (c2)
C
CREATE UNIQUE INDEX xtab1 ON tab1 (c2, c1)
D
CREATE UNIQUE INDEX xtab1 ON tab1 (c2) INCLUDE (c1）
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Which two operations can be performed on an external table（）A、Create a view on the table.B、Create an index on the table.C、Create a synonym on the table.D、Add a virtual column to the table.E、Update the table using the UPDATE statement.F、Delete rows in the table using the DELETE command
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单选题Given the following two tables: TAB1 C1 C2 1 Antarctica 2 Africa 3 Asia 4 Australia TAB2 CX CY 5 Europe 6 North America 7 South America Which of the following SQL statements will insert all rows found in table TAB2 into table TAB1?（）A
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考题
单选题Given the following DDL for the PARTS table:CREATE TABLE parts (part_no INT(9) NOT NULL, part_name VARCHAR(24), part_remain INT(9));All part numbers entered will be different and all rows should be displayed in order of increasing part numbers whenever the table is queried. Which of the following create index statements will meet this criteria and require the least amount of storage for the index object?（）A
CREATE UNIQUE INDEX idx_partno ON parts(part_no)B
CREATE UNIQUE INDEX idx_partno ON parts(part_name ASC)C
CREATE UNIQUE INDEX idx_partno ON parts(part_name, part_no ASC)D
CREATE UNIQUE INDEX idx_partno ON parts(part_no, part_name ASC)
考题
单选题Table TAB1 was created using the following statement: CREATE TABLE tab1 (c1 INT, c2 INT, c3 INT, c4 INT, c5 INT); If column C1 is unique and queries typically access columns C1, C2 and C3 together, which statement(s) will createindex(es) that will provide optimal query performance?（）A
CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c2) INCLUDE (c3) B
CREATE UNIQUE INDEX xtab1 ON tab1 (c1) INCLUDE (c2, c3) C
CREATE UNIQUE INDEX xtab1 ON tab1 (c3, c2, c1) D
CREATE UNIQUE INDEX xtab1 ON tab1 (c2) INCLUDE (c1, c3)
考题
单选题View the Exhibit and examine the structure of the EMP table. You executed the following command to add a primary key to the EMP table： ALTER TABLE emp ADD CONSTRAINT emp_id_pk PRIMARY KEY （emp_id） USING INDEX emp_id_idx； Which statement is true regarding the effect of the command？（）A
The PRIMARY KEY is created along with a new index.B
The PRIMARY KEY is created and it would use an existing unique index.C
The PRIMARY KEY would be created in a disabled state because it is using an existing index.D
The statement produces an error because the USING clause is permitted only in the CREATE TABLE command.
考题
单选题Given the following statements: CREATE TABLE tab1 (col1 INT); CREATE TABLE tab2 (col1 INT); CREATE TRIGGER trig1 AFTER UPDATE ON tab1 REFERENCING NEW AS new1 FOR EACH ROW MODE DB2SQL INSERT INTO tab2 VALUES(new1.col1); INSERT INTO tab1 VALUES(2),(3); What is the result of the following query? SELECT count(*) FROM tab2;（）A
3B
2C
1D
0
考题
单选题Table TAB1 was created using the following statement: CREATE TABLE tab1 (c1 INT, c2 INT, c3 INT, c4 INT, c5 INT); If column C1 is unique and queries typically access columns C1 and C2 together, which statement(s) will create index(es) that will provide optimal query performance? （）A
CREATE UNIQUE INDEX xtab1 ON tab1 (c1) include (c2)B
CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c3) INCLUDE (c2) C
CREATE UNIQUE INDEX xtab1 ON tab1 (c2, c1)D
CREATE UNIQUE INDEX xtab1 ON tab1 (c2) INCLUDE (c1）
考题
单选题设有表T，现要在该表新增加一个列，列名为：c1，类型为int。下列能实现该功能的语句是（）。A
ALTER TABLE T ADD COLUMN c1 intB
ALTER TABLE T ADD （c1 int）C
ALTER TABLE T ADD COLUMN c1D
ALTER TABLE T ADD c1
考题
单选题Given the following two tables: TAB1 C1 C2 A 11 B 12 C 13 TAB2 CX CY A 21 C 22 D 23 The following results are desired: C1 C2 CX CY A 11 A 21 C 13 C 22 -- --D 23 Which of the following queries will yield the desired results?（）A
SELECT * FROM tab1 INNER JOIN tab2 ON c1=cxB
SELECT * FROM tab1 LEFT OUTER JOIN tab2 ON c1=cxC
SELECT * FROM tab1 FULL OUTER JOIN tab2 ON c1=cxD
SELECT * FROM tab1 RIGHT OUTER JOIN tab2 ON c1=cx
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