大约有 7,000 项符合查询结果（耗时：0.0152秒） [XML]
How to remove leading and trailing whitespace in a MySQL field?
...really curious as to why this answer's got so many upvotes. Are you using mysql? What version?
– billynoah
May 16 '16 at 4:30
...
How can I search (case-insensitive) in a column using LIKE wildcard?
...
Friendly reminder that this is a mysql answer. If you're using PostgreSQL, ILike is the solution to the above question.
– Steve
Sep 6 '13 at 5:57
...
Why is a “GRANT USAGE” created the first time I grant a user privileges?
...to the admin side of DBMS and was setting up a new database tonight (using MySQL) when I noticed this. After granting a user a privilege for the first time, another grant is created that looks like
...
ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage? [closed]
...have also heard good things about Sphinx, especially in conjunction with a MySQL database. Have not used it, though.
IMO, you should choose according to:
The required functionality - e.g. do you need a French stemmer? Lucene and Solr have one, I do not know about the others.
Proficiency in the im...
How can I append a string to an existing field in MySQL?
...
You need to use the CONCAT() function in MySQL for string concatenation:
UPDATE categories SET code = CONCAT(code, '_standard') WHERE id = 1;
share
|
improve this...
What is the difference between 127.0.0.1 and localhost
...
@DonViegues That's MySQL specific and IMO bad design. It will see localhost and tries to use unix-socket instead of connecting using IP but for 127.0.0.1 it just uses IP.
– Arman Ordookhani
Jul 18 '19 at 8...
PostgreSQL Autoincrement
I'm switching from MySQL to PostgreSQL and was wondering how I can do autoincrement values. I saw in the PostgreSQL docs a datatype "serial", but I get syntax errors when using it (in v8.0).
...
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...
Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails
...s another, but it is failing for some reason. With my limited knowledge of MySQL, the only thing that could possibly be suspect is that there is a foreign key on a different table referencing the one I am trying to reference.
...
MySQL: How to copy rows, but change a few fields?
...
MySQL supports the TEMPORARY keyword to create temporary tables. Usage of CREATE TEMPORARY TABLE will automagically drop the table when the session (a serie of SQL queries) is finished. Dropping the table wouldn't be necessar...