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Which two statements are true regarding the USING and ON clauses in table joins?（）
- A、Both USING and ON clauses can be used for equijoins and nonequijoins
- B、Amaximum of one pair of columns can be joined between two tables using the ON clause
- C、The ON clause can be used to join tables on columns that have different names but compatible data types
- D、The WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause
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更多 “Which two statements are true regarding the USING and ON clauses in table joins?（）A、Both USING and ON clauses can be used for equijoins and nonequijoins B、Amaximum of one pair of columns can be joined between two tables using the ON clause C、The ON clause can be used to join tables on columns that have different names but compatible data types D、The WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause ” 相关考题
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In which four clauses can a subquery be used? ()
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In which of the following situations should correlation names be used?()
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Which two statements are true regarding the USING clause in table joins?（）A、It can be used to join a maximum of three tables B、It can be used to restrict the number of columns used in a NATURAL join C、It can be used to access data from tables through equijoins as well as nonequijoins D、It can be used to join tables that have columns with the same name and compatible data types
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In which of the following situations should correlation names be used?（）A、A table referenced in the FROM clause has no indexed column.B、The table referenced in the FROM clause has more than 200 columns.C、Two or more tables in the FROM clause have identical column names.D、The FROM clause contains two or more tables in the SELECT statement.
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Which of the following statements is true regarding the VERSIONS BETWEEN clause？（） A、 The VERSIONS BETWEEN clause may be used in DML statements.B、 The VERSIONS BETWEEN clause may be used in DDL statements.C、 The VERSIONS BETWEEN clause may not be used to query past DDL changes to tables.D、 The VERSIONS BETWEEN clause may not be used to query past DML statements to tables.
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Which three statements are true regarding subqueries?（）A、Subqueries can contain GROUP BY and ORDER BY clauses B、Main query and subquery can get data from different tables C、Main query and subquery must get data from the same tables D、Subqueries can contain ORDER BY but not the GROUP BY clause E、Only one column or expression can be compared between the main query and subqueryF、 Multiple columns or expressions can be compared between the main query and subquery
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In which four clauses can a subquery be used? （）A、in the INTO clause of an INSERT statementB、in the FROM clause of a SELECT statementC、in the GROUP BY clause of a SELECT statementD、in the WHERE clause of a SELECT statementE、in the SET clause of an UPDATE statementF、in the VALUES clause of an INSERT statement
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Which two statements are true regarding subqueries? （）A、A subquery can retrieve zero or more rows B、Only two subqueries can be placed atone level C、A subquery can be used only in SQL query statements D、A subquery can appear on either side of a comparison operator E、There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement
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Which three statements are true regarding single-row functions？（）A、 They can accept only one argument.B、 They can be nested up to only two levels.C、 They can return multiple values of more than one data type.D、 They can be used in SELECT， WHERE， and ORDER BY clauses. E、 They can modify the data type of the argument that is referenced.F、 They can accept a column name， expression， variable name， or a user-supplied constant as arguments.
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多选题Which two statements are true regarding the USING clause in table joins?（）AIt can be used to join a maximum of three tablesBIt can be used to restrict the number of columns used in a NATURAL joinCIt can be used to access data from tables through equijoins as well as nonequijoinsDIt can be used to join tables that have columns with the same name and compatible data types
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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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多选题You create a table with the PERIOD FOR clause to enable the use of the Temporal Validity feature of Oracle Database 12c. Examine the table definition: Which three statements are true concerning the use of the Valid Time Temporal feature for the EMPLOYEES table?（）AThe valid time columns employee_time_start and employee_time_end are automatically created.BThe same statement may filter on both transaction time and valid temporal time by using the AS OF TIMESTAMP and PERIOD FOR clauses.CThe valid time columns are not populated by the Oracle Server automatically.DThe valid time columns are visible by default when the table is described.ESetting the session valid time using DBMS_FLASHBACK_ARCHIVE.ENABLE_AT_VALID_TIME sets the visibility for data manipulatio
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单选题Which of the following statements is true regarding the VERSIONS BETWEEN clause？（）A
The VERSIONS BETWEEN clause may be used in DML statements.B
The VERSIONS BETWEEN clause may be used in DDL statements.C
The VERSIONS BETWEEN clause may not be used to query past DDL changes to tables.D
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多选题Which two statements are true about WHERE and HAVING clauses? （）AA WHERE clause can be used to restrict both rows and groups.BA WHERE clause can be used to restrict rows only.CA HAVING clause can be used to restrict both rows and groups.DA HAVING clause can be used to restrict groups only.EA WHERE clause CANNOT be used in a query of the query uses a HAVING clause.FA HAVING clause CANNOT be used in subqueries.
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