Does the barcode represent a type of item or a unique item?

There are many kinds of bars, there is a two-dimensional, shampoo is a product category, jet printed, scanned by a reader, and the computer recognizes the name of the product, shelf, **. Usually the product is a class of products. But if the supermarket label is pasted with the white one, it is the ** barcode, which is the product.

For example, if the barcode of your bottle is damaged, you can scan it with the same bottle as another bottle, and after the ** is out, you can still take away your broken voucher, as long as the porcelain is removed. For example, in foreign stores, generally you don't need to scan the product, as long as the person receiving the money scans the barcode on the card.

The barcode only represents the product type number, and has nothing to do with the quantity, the date of manufacture, or the factory number.

No, this breed is represented.

Uniqueness: the same specification and the same product correspond to the same product**, and the same product with different specifications should correspond to different products**. According to the different properties of the product, such as: weight, packaging, specifications, smell, color, shape, etc., give different goods**.

Permanent: Once a product is assigned, it is no longer changed and is lifelong. When such a product is no longer produced, its corresponding product** can only be shelved and cannot be reused and redistributed to other commodities.

Non-meaning: In order to ensure that ** has enough capacity to meet the needs of frequent product upgrading, it is best to use non-meaning sequential codes.

No, it represents the same category, you can buy two bottles of dish soap and see if you know, haha

is unique. There are two types of barcodes, one is the factory that is printed on the product by the manufacturer when it leaves the factory, and the other is the in-store code printed by the supermarket itself.

If it is a factory code, then the same commodity barcode is consistent, and it is the same in each shopping mall and supermarket. If it is an in-store code, then the coding rules of each supermarket are different, and the code of the same product in each supermarket is different. The in-store code is mainly for some products processed on site, such as delicatessen, bread, etc.

Most products do not need to be designated by the supermarket in-store code, and can be directly used with the factory code.

The barcode marks the country of production, manufacturer, commodity name, production date, book classification number, mail start and end location, category, date and many other information, and is widely used in many fields such as commodity circulation, book management, postal management, and banking system.

The general commodity barcode is generally composed of a prefix part, a manufacturer**, a product** and a check code. The prefix code in the commodity barcode is used to identify the country or region, and the right to assign the code is in the International Article Numbering Association, such as 00-09 on behalf of the United States, Canada on behalf of Japan. 69 represents Chinese mainland, 471 represents Taiwan, and 489 represents Hong Kong SAR.

The empowerment of manufacturers** is in the article coding organization of each country or region, and China is given to manufacturers by the National Article Coding Center**. The commodity is used to identify the commodity, and the right to assign the code is exercised by the product manufacturer itself, and the commodity barcode.

At the end of the product barcode, a 1-digit check code is used to verify the correctness of the 1st 12th digit ** from the left in the product barcode. Commodity barcode refers to a set of regularly arranged bars, spaces and their corresponding characters to represent a certain commodity information symbols. The strip is dark and the empty is light, which is used for scanning and reading of barcode reading equipment.

Its corresponding character consists of a set of Arabic numerals, which can be read directly or used by a keyboard to enter data into a computer. This set of blanks and the corresponding characters represent the same information.

The product is generally a size 69. Commodity barcode (69 barcode) is generally divided into 4 parts, according to 3-5-4-1 points, the first part represents the country, the second part represents the manufacturer, the third part represents the factory goods**, the fourth part is the validity code:

Take the barcode 6936983800013 as an example, this barcode is divided into 4 parts, from left to right:

1-3 digits: a total of 3 digits, corresponding to the barcode of 693, is one of the national ** in China. (690--699 are all China's **, distributed internationally);

4-8 digits: a total of 5 digits, corresponding to the barcode of 69838, on behalf of the manufacturer**, applied by the manufacturer, allocated by the state;

9-12 digits: a total of 4 digits, corresponding to the barcode 0001, representing the goods in the factory**, determined by the manufacturer;

The 13th digit: a total of 1 digits, corresponding to the 3 of the barcode, is the check code, according to a certain algorithm (generally using barcode software, the last check code automatically pops up by the software system), calculated by the first 12 digits.

In order for users to be able to display the corresponding product information after scanning the barcode, they need to compile goods for the product after applying for manufacturer identification, and report the code information through the China commodity information service platform to carry out online management and application of commodity code information.

Meaning of product barcode numbers:

Take barcode 6936983800013, for example.

This barcode is divided into 4 parts, from left to right:

1-3 digits: a total of 3 digits, corresponding to the barcode of 693, is one of the national ** in China. (690--695 are all China's **, distributed internationally).

4-8 digits: a total of 5 digits, corresponding to the barcode of 69838, on behalf of the manufacturer**, applied by the manufacturer, allocated by the state;

9-12 digits: a total of 4 digits, corresponding to the barcode 0001, representing the goods in the factory**, determined by the manufacturer;

The 13th digit: a total of 1 digit, corresponding to the 3 of the barcode, is the check code, according to a certain algorithm, calculated by the first 12 digits and obtained.

Formula 13th Bit Algorithm:

1: Take out the sum of the odd digits of the number, c1=6+3+9+3+0+0=21;

2: Take out the sum of the even digits of the number, c2=9+6+8+8+0+1=32;

3: Add the sum of odd digits to "three times the sum of even digits".

4: The single digit of the result: 117 (117%10=7);

5: Subtract the single digit from 10: 10-7=3;

6: Take a single digit for the obtained number (for 10 to remove the remainder) 3% 10 = 3;