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最新的 Oracle Database 19c 1Z1-082 免費考試真題 (Q140-Q145):

問題 #140
Which two statements are true about the WHERE and HAVING clauses in a SELECT statement?
(Choose two.)

A. WHERE and HAVING clauses can be used in the same statement only if applied to different table columns
B. The HAVING clause can be used with aggregating functions in subqueries
C. Aggregating functions and columns used in HAVING clauses must be specified in the SELECT list of a query
D. The WHERE clause can be used to exclude rows before dividing them into groups
E. The WHERE clause can be used to exclude rows after dividing them into groups

答案：B,D

問題 #141
Which three are true about the Oracle Optimizer? (Choose three.)

A. It will only generate SQL Plan Directives specific to a given SQL statement.
B. It determines the optimal table join order and method.
C. It generates execution plans for SQL statements based on relevant schema objects, system and session parameters, and information found in the Data Dictionary.
D. It can optimize only SELECT statements.
E. It updates stale object statistics in the Data Dictionary.
F. It can re-optimize execution plans after previous executions detect suboptimal plans.

答案：B,C,D

問題 #142
Which three statements are true about data block storage in an Oracle Database?

A. A block header contains a row directory pointing to all rows in the block.
B. A table block must always contain row data.
C. A data block header is of a fixed length.
D. Row data is stored starting at the end of the block.
E. An index block can contain row data.

答案：A,C

問題 #143
Which two statements are true about the rules of precedence for operators? (Choose two.)

A. NULLS influence the precedence of operators in an expression
B. Arithmetic operators with equal precedence are evaluated from left to right within an expression
C. The concatenation operator | | is always evaluated before addition and subtraction in an expression
D. The + binary operator has the highest precedence in an expression in a SQL statement
E. Multiple parentheses can be used to override the default precedence of operators in an expression

答案：D,E

問題 #144
Examine these SQL statements which execute successfully:

Which two statements are true after execution?

A. The foreign key constraint will be disabled.
B. The primary key constraint will be enabled and deferred.
C. The primary key constraint will be enabled and immediate.
D. The foreign key constraint will be enabled and deferred.
E. The foreign key constraint will be enabled and immediate.

答案：A

問題 #145
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最新的 Oracle Database 19c 1Z1-082 免費考試真題 (Q140-Q145):