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mysql paging method

Common mysql paging methods include using LIMIT clause, using ROWNUM, using subquery and LIMIT, using cursor (Cursor), using ORM framework, etc. If you want to know more about mysql paging, you can read the articles below this topic.

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time：2023-10-26 16:57:01

What is the method of paging in mysql Mysql paging methods include using LIMIT clause, using ROWNUM, using subquery and LIMIT, using cursor (Cursor), using ORM framework, etc. Detailed introduction: 1. Use LIMIT clause: This is the most commonly used paging method. The number of query results can be specified through the LIMIT clause; 2. Use ROWNUM: In some old versions of MySQL, ROWNUM can be used to simulate paging; 3 , using subqueries and LIMIT, etc.

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How to optimize mysql paging query Optimization methods for paging queries: 1. Subquery optimization, performance improvement can be achieved by rewriting paging SQL statements into subqueries. 2. ID limitation optimization, you can calculate the range of queried IDs based on the number of queried pages and the number of queried records, and then query based on the "id between and" statement. 3. Optimize based on index reordering, find relevant data addresses through the index, and avoid full table scans. 4. For delayed association optimization, you can use JOIN to first complete the paging operation on the index column, and then return to the table to obtain the required columns.

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Mysql paging problem under millions of data During the development process, we often use paging. The core technology is to use limit to read data. During the paging test using limit, the following data was obtained: select * from news order by id desc limit 0,10, which took 0.003 seconds.

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What is the difference between oracle paging and mysql paging Differences: 1. Oracle uses rownum for paging operations. Rownum can only be compared to less than but not greater than because this method queries first and then sorts; 2. MySQL uses limit for paging operations. The parameter value in limit cannot be written in the statement. Calculation expressions need to be calculated in advance.

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