Article Introduction：There are more than two duplicate records. The first is a completely duplicate record, that is, a record in which all fields are repeated. The second is a record in which some key fields are repeated, such as the Name field is repeated, while other fields are not necessarily repeated or can be ignored. .

2017-01-21 comment 0  1022

Article Introduction：When importing Excel data recently, I need to check whether the data is duplicated: 1. Want to check whether the Excel data itself is duplicated? 2. Does the data in Excel duplicate the data in the database?

2017-02-18 comment 0  1579

Article Introduction：去重复

2016-06-23 comment 0  955

Article Introduction：PHP array deduplication method reference (one-dimensional array deduplication, two-dimensional array deduplication)

2016-07-25 comment 0  1501

Article Introduction：This article discusses best practices for handling duplicate data generated by the mock.mock library. It explains the causes of duplicate data and provides solutions to avoid it, including using different seed values, non-duplicate mock templates, an

2024-08-15 comment 0  1142

Article Introduction：ThinkPHP6 form repeated submission processing: preventing repeated operations In web application development, form submission is a common operation. However, sometimes users may submit forms repeatedly due to network delays or misoperations, which may cause some problems to the system. In order to solve this problem, we can perform repeated form submission processing in the ThinkPHP6 framework to prevent users from repeated operations. 1. Cause analysis There are two main reasons for repeated submission of forms: 1. Network delay: When the user clicks the submit button, the form

2023-08-12 comment 0  2067

Article Introduction：Duplicate entry. Duplicate entry 'zhoulie' for key 2, just remove the auto_increment from the primary key of the database and it will be solved. There is no problem with the program itself.

2016-07-13 comment 0  1160

Article Introduction：CSS (Cascading Style Sheets) can be said to be an important part of modern web design. It can achieve better layout effects on web pages and make the user interface more beautiful and easier to use. However, with the continuous increase and complexity of web pages, the scale of CSS is also getting larger and larger. There are many repeated style codes in many projects, resulting in CSS files that are too large, inefficient, and difficult to maintain. In order to solve this problem, not repeating CSS has become an important measure for CSS optimization. So what is non-repeating CS?

2023-05-27 comment 0  508

Article Introduction：In a MySQL database, duplicate data may occur. This duplicate data can affect database performance and reliability. Therefore, we need to learn how to remove duplicate data to ensure the correctness and integrity of the database. The following are several methods to remove duplicate data in a MySQL database: Method 1: Use the DISTINCT keyword The DISTINCT keyword can be used to remove duplicate records from the results of a query. For example, we can use the following SQL statement to select

2023-05-12 comment 0  9296

Article Introduction：The method for filtering duplicate values ​​in WPS is: 1. First, switch to the [Data] tab; 2. Then, click the [Duplicates], [Highlight Duplicates], and [Settings] options in sequence; 3. Finally, set the search for duplicates range of items and click the [Delete Duplicates] option.

2020-03-06 comment 0  6894

Article Introduction：After opening the Excel file, select the area that needs to be searched for duplicates, and click the duplicate item menu in [Featured Functions]. A dialog box will pop up to confirm whether the area is correct. If it is correct, click OK. After clicking OK, the duplicate items will be highlighted. Disable duplicate entries Select columns that do not allow duplicate entries, for example: Column C. Click the duplicate item menu, and after confirmation, a prompt will appear for the user to select related operations when entering duplicate items.

2024-04-17 comment 0  1244

Article Introduction：Below I will share with you an example of Python deduplication of multi-attribute duplicate data. It has a good reference value and I hope it will be helpful to everyone. Let's come and take a look together

2018-04-18 comment 0  2475

Article Introduction：SQL statement to remove duplicate records and obtain duplicate records

2018-05-28 comment 0  1767

Article Introduction：MySQL is a commonly used relational database management system with powerful functions and flexible performance. When using MySQL, we often encounter duplicate data in data tables, which not only affects the accuracy of the data, but also brings trouble to query and analyze the data. Therefore, when processing data in MySQL, it is often necessary to delete duplicate data. This article will introduce how to use SQL statements to remove duplicate data in MySQL. 1. Find duplicate records. Before deleting duplicate data, we need to first find duplicate records in the data table.

2023-05-18 comment 0  1003

Article Introduction：As enterprise data continues to grow, duplicate data has become an important issue in database management. In Oracle database, duplicate data will lead to inaccurate query results, consume storage space and affect database performance. Therefore, deduplication is necessary. This article will introduce several methods to delete duplicate data in Oracle database. Method 1: Using subqueries and grouping Before deleting duplicate data, we first need to understand what duplicate data is. In an Oracle database, two or more records are duplicates if they have all the same columns.

2023-05-18 comment 0  1512

Article Introduction：Methods to remove duplicates from javascript arrays: 1. Use the "indexOf()" method to remove duplicate values; 2. Use the splice method to remove duplicate values; 3. Use the new set Set in es6 to remove duplicate values.

2021-04-08 comment 0  8419

Article Introduction：PHP array values ​​can be repeated. The key name of the array is unique and cannot exist repeatedly, but the key value of the array can exist repeatedly. How to handle duplicate values ​​in PHP arrays: 1. Use the "array_unique()" function to remove duplicate values ​​in the array; 2. Use the "array_count_values()" function to count the number of occurrences of all values ​​in the array.

2023-06-12 comment 0  1607

Article Introduction：Count duplicate values

2016-07-25 comment 0  1009

Article Introduction：This article focuses on repeating HTML elements

2017-02-13 comment 0  1991