Which four are correct guidelines for naming database tables? （）A、Must begin with either a number or a letter.B、Must be 1-30 characters long.C、Should not be an Oracle Server reserved word.D、Must contain only A-Z, a-z, 0-+, _, *, and #.E、Must contain only

题目

Which four are correct guidelines for naming database tables? （）

  • A、Must begin with either a number or a letter.
  • B、Must be 1-30 characters long.
  • C、Should not be an Oracle Server reserved word.
  • D、Must contain only A-Z, a-z, 0-+, _, *, and #.
  • E、Must contain only A-Z, a-z, 0-9, _, $, and #.
  • F、Must begin with a letter.
相似考题

1.Your team has prepared a CPM schedule for your review. You notice that one node has six inputs (including two dummy activities) and four outputs (which include one dummy activity). Select the correct statement from the following:A.This is a valid representation if the logic is correct.B.This is invalid because a node can have a maximum of one dummy input representation if the logic is correct.C.This is invalid because nodes cannot have both dummy inputs and dummy outputs.D.This is a invalid because the number of outputs must equal the number of inputs.E.This is invalid because a maximum of two inputs and two outputs are allowed using the critical path method.

2.Which four are correct guidelines for naming database tables? ()A. Must begin with either a number or a letter.B. Must be 1-30 characters long.C. Should not be an Oracle Server reserved word.D. Must contain only A-Z, a-z, 0-+, _, *, and #.E. Must contain only A-Z, a-z, 0-9, _, $, and #.F. Must begin with a letter.

3.A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four strokeA.①B.②C.① and ②D.Neither ① nor ② is correct

4.● Your team has prepared a CPM schedule for your review. You notice that one node has six inputs (including two dummy activities) and four outputs (which include one dummy activity). Select the correct statement from the following:A This is a valid representation if the logic is correct.B This is invalid because a node can have a maximum of one dummy input representation if the logic is correct.C This is invalid because nodes cannot have both dummy inputs and dummy outputs.D This is a invalid because the number of outputs must equal the number of inputs.E This is invalid because a maximum of two inputs and two outputs are allowed using the critical path method.

参考答案和解析
正确答案:B,C,E,F
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    Must begin with either a number or a letter.

    B

    Must be 1-30 characters long.

    C

    Should not be an Oracle Server reserved word.

    D

    Must contain only A-Z, a-z, 0-+, _, *, and #.

    E

    Must contain only A-Z, a-z, 0-9, _, $, and #.

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