大约有 19,000 项符合查询结果(耗时:0.0275秒) [XML]

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What is maximum query size for mysql?

What is maximum query size for mysql? Some times the server stops working when I fire a too long query. 2 Answers ...
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FIND_IN_SET() vs IN()

...ould even use an index on companyID. Unfortunately, this does not work in MySQL since the latter does not support arrays. You may find this article interesting (see #2): 10 things in MySQL (that won’t work as expected) Update: If there is some reasonable limit on the number of values in the...
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How to delete a certain row from mysql table with same column values?

I have a problem with my queries in MySQL. My table has 4 columns and it looks something like this: 6 Answers ...
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Select last N rows from MySQL

I want to select last 50 rows from MySQL database within column named id which is primary key . Goal is that the rows should be sorted by id in ASC order, that’s why this query isn’t working ...
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PDO mysql: How to know if insert was successful

I'm using PDO to insert a record (mysql and php) 7 Answers 7 ...
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Update date + one year in mysql

When I want setting numerical value +1 in mysql table, I use e.g.: 3 Answers 3 ...
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MySQL - Rows to Columns

...ts, but I only found solutions for SQL Server/Access. I need a solution in MySQL (5.X). 12 Answers ...
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致PHP路上的“年轻人” - PHP - 清泛IT社区,为创新赋能!

...段落的“过来人”,还是想写点东西给“年轻人”。关于如何成长?我直白的答案还是建议通过实践,通过项目来成长。虽然提倡多参加项目,但项目不能是乱七八糟的项目什么都去尝试做,对于刚工作的同学,希望做这两类项...
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mysql实现split分割字符串(length, SUBSTRING_INDEX, substring) - 爬虫/...

由于MySql没有直接的split函数,只提供了length, SUBSTRING_INDEX, substring三个函数,这里介绍如何用这三个函数实现split功能。 # SUBSTRING_INDEX(str, delim, count):返回字符串 str 中在第 count 个出现的分隔符 delim 之前的子串。如果 count 是...
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Mysql substr和Oracle substr区别 - 爬虫/数据库 - 清泛IT社区,为创新赋能!

Oracle substr(字符串,开始索引、从0起,长度) Mysql substr或substring(字符串,开始索引、从1起,长度)