Manipulate Data
Akopọ
A database is only as useful as the questions you can ask of it. A garage with three hundred cars in stock does not want to scroll through every row; it wants to see, in one click, only the Fords under $4000, sorted from cheapest to dearest, with the profit on each one worked out automatically. That is what manipulating data means: searching, sorting and calculating so the right information rises to the surface.
In this lesson you will learn to write queries that select exactly the records you want using the operators AND, OR, NOT and the comparisons such as greater than and less than, and to search inside text using wildcards. You will sort data into ascending or descending order on one or more fields, and create calculated fields and summaries that compute totals and averages at run time. These are core skills of the practical database papers.
Awọn Afojusun
- Perform calculations.
- Use arithmetic operations or numeric functions to perform calculations including calculated fields, calculated controls Use formulae and functions to perform calculations at run time including addition, subtraction, multiplication, division, sum, average, maximum, minimum, count.
- Sort data.
- Use a single criterion, or multiple criteria to sort data into ascending or descending order.
- Search and select data.
- Use a single criterion, or multiple criteria to select subsets of data using a query perform searches using a variety of operators including AND, OR, NOT, LIKE, >, <, =, >=, <=, <> perform searches using wildcards.
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Manipulate Data. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which logical operator returns records only when every condition is true? A. OR B. NOT C. AND D. LIKE Answer: C
- The criterion >=10 placed in a Quantity field selects records where the quantity is: A. less than 10 B. exactly 10 only C. 10 or more D. less than or equal to 10 Answer: C
- Which search would find all colours that begin with the letters Bl? A. *Bl B. Bl* C. *Bl* D. =Bl Answer: B
- A new field defined as Profit: [SPrice] - [PPrice] is an example of a: A. Primary key B. Validation rule C. Calculated field D. Foreign key Answer: C
- Which function returns the number of records in a group? A. SUM B. AVG C. MAX D. COUNT Answer: D
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Manipulate Data? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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