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对于表A（col1 int，col2 char（1））更新col1=1的数据col2值为N，下面语句正确的是（）
- A、update table A setcol2=’N’ where col1=1
- B、modify table A setcol2=N where col1=1
- C、update A set col2=’N’ where col1=1
- D、modify A set col2=N where col1=1
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更多 “对于表A（col1 int，col2 char（1））更新col1=1的数据col2值为N，下面语句正确的是（）A、update table A setcol2=’N’ where col1=1B、modify table A setcol2=N where col1=1C、update A set col2=’N’ where col1=1D、modify A set col2=N where col1=1” 相关考题
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单选题对于表A（col1 int，col2 char（1）），表B（col1 int，col2char（1）），为确保表A的数据全部被保留，下面正确的联接方式是（）A
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COL1 will accept NULL values and can be referenced in another table's foreign key specification.B
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COL1 will accept NULL values and cannot be referenced in another tables foreign key specification.
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更新DB1数据库中表Table1的所有统计信息B
在DB1数据库中，使用CREATE STATISTICS 语句为表Table1的列col3创建缺少的统计信息C
设置优先值提升选项的值为1D
执行如下语句：USE DB1 GO CREATE INDEX index1 ON table1（col3） INCLUDE（col1， col2） WITH （ONLINE = ON） GOE
执行如下语句 USE DB1GOCREATE INDEX index1 ON table1（col3， col2，col1）
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单选题Given the following DDL and INSERT statements: CREATE VIEW v1 AS SELECT col1 FROM t1 WHERE col1 10; CREATE VIEW v2 AS SELECT col1 FROM v1 WITH CASCADED CHECK OPTION; CREATE VIEW v3 AS SELECT col1 FROM v2 WHERE col1 100; INSERT INTO v1 VALUES(5); INSERT INTO v2 VALUES(5); INSERT INTO v3 VALUES(20); INSERT INTO v3 VALUES(100); How many of these INSERT statements will be successful?（）A
0B
1C
2D
3
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单选题A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 1000 ; When will DB2 access the data from table T1 for view V1?（）A
When view V1 is createdB
Each time the REFRESH VIEW v1 statement is executedC
Each time an SQL statement is executed against view V1D
Only the first time an SQL statement is executed against view V1
考题
单选题A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3, col4 FROM t1 WHERE col4 1000 WITH CHECK OPTIONWhat is the effect of the CHECK OPTION clause?（）A
Any row inserted or updated through view V1 must meet the condition that col4 1000.B
From now on, any row inserted or updated in table T1 must meet the condition that col4 1000, but existing rows in the table are not checked.C
At view creation, DB2 will check the data in table T1, and if in any row doesn't meet the condition col4 1000, the view creation will be rejected.D
Any row inserted or updated through view V1 must meet the condition that col4 1000 and no row in table T1 can be updated such that col4 = 1000, but new rows in the table can be inserted with col4 = 1000.
考题
单选题The following statements: CREATE TABLE t1 (col1 INT NOT NULL, PRIMARY KEY(col1)); CREATE TABLE t2 (col1 INT NOT NULL, col2 CHAR(1) NOT NULL, PRIMARY KEY (col1, col2), FOREIGN KEY (col1) REFERENCES t1 (col1) ON DELETE CASCADE ON UPDATE RESTRICT); CREATE TABLE t3 (col1 INT NOT NULL, col2 INT NOT NULL, PRIMARY KEY (col1, col2),FOREIGN KEY (col1) REFERENCES t1 (col1) ON DELETE NO ACTION ON UPDATE RESTRICT);INSERT INTO t1 VALUES (1), (2); INSERT INTO t2 VALUES (1, 'a'), (1, 'b'), (2,'c'); INSERT INTO t3 VALUES (1, 100), (2, 200), (2,300); How many rows will be deleted by the following DELETE statement? DELETE FROM t1 WHERE col1= 1;（）A
4B
3C
1D
0
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