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Prepared Statement是Statement的子接口，使用Prepared Statement要比使用Statement性能更高。
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更多 “Prepared Statement是Statement的子接口，使用Prepared Statement要比使用Statement性能更高。” 相关考题
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Statement是PreparedStatement的父接口。Statement对象用于执行不带参数的简单SQL语句;PreparedStatement对象用于执行预编译SQL语句。()
此题为判断题(对，错)。
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Your Oracle10g database contains a table with a TIMESTAMP TO LOCAL TIME ZONE column. There are about two hundred column values for the column. You issued the following statement： SQL ALTER DATABASE SET TIME_ZONE =’Europe/London’； What will be the result of issuing the above statement？（）A、 The statement will be executed successfully， and a new time zone will be set for the database.B、 The statement will be executed successfully， but a new time zone will not be set for the database.C、 The statement will not be executed successfully because the SET TIME_ZONE clause can be used only with the ALTER SESSION statement.D、 The statement will not be executed successfully because the ALTER DATABASE SET TIME_ZONE statement is used only when the database contains no table with the TIMESTAMP TO LOCAL TIME ZONE column.
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Evaluate the set of SQL statements: CREATE TABLE dept (deptno NUMBER(2), dname VARCNAR2(14), 1oc VARCNAR2 (13)); ROLLBACK; DESCRIBE DEPT What is true about the set?（）A、The DESCRIBE DEPT statement displays the structure of the DEPT table.B、The ROLLBACK statement frees the storage space occupies by the DEPT table.C、The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.D、The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.
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Where can subqueries be used?（）A、field names in the SELECT statement B、the FROM clause in the SELECT statement C、the HAVING clause in the SELECT statementD、the GROUP BY clause in the SELECT statement E、the WHERE clause in only the SELECT statement F、the WHERE clause in SELECT as well as all DML statements
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单选题View the Exhibit and examine the structure of the ORDERS and ORDERJTEMS tables. Evaluate the following SQL statement： SELECT oi.order_id， product_jd， order_date FROM order_items oi JOIN orders o USING （order_id）； Which statement is true regarding the execution of this SQL statement？（）A
The statement would not execute because table aliases are not allowed in the JOIN clause.B
The statement would not execute because the table alias prefix is not used in the USING clause.C
The statement would not execute because all the columns in the SELECT clause are not prefixed with table aliases.D
The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list.
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