大约有 9,000 项符合查询结果（耗时：0.0197秒） [XML]
How to edit multi-gigabyte text files? Vim doesn't work =( [closed]
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Great tip. I had a 13GB (152.000.000 lines) sql-file, and just using "split -l 1000000" then editing the one million line files where I wanted with vim worked great. Took 10 minutes just to split them. (I tried to open the original file with vim and that worked, but it...
What does an underscore in front of an import statement mean?
I saw this example from sqlite3 on GitHub :
4 Answers
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In JPA 2, using a CriteriaQuery, how to count results
... the number of results and the actual results which I know is analogous to SQL, but which would make this API a lot more OOP-like. Well, at least I can reuse some of the predicates, I guess.
– Sean Patrick Floyd
May 21 '10 at 18:34
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PostgreSQL query to return results as a comma separated list
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SELECT string_agg(id::text, ',') FROM table
Requires PostgreSQL 9.0 but that's not a problem.
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How can I delete a file from a Git repository?
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git filter-branch -f --index-filter 'git rm --cached --ignore-unmatch *.sql'
Note: Replace *.sql with your file name or file type. Be very careful because this will go through every commit and rip this file type out.
EDIT:
pay attention - after this command you will not be able to push or pul...
What is the difference between an ORM and an ODM?
...bject Document Mapper) deals with documents. Am I right in assuming that mySQL is an example of ORM and MongoDB is a example of ODM?
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MySQL - why not index every field?
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The link is for MS SQL Server; this question is for MySQL
– OMG Ponies
Mar 26 '11 at 23:38
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update columns values with column of another table based on condition [duplicate]
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it's not working in mysql
– cikatomo
Sep 30 '15 at 19:30
22
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How to alter a column's data type in a PostgreSQL table?
Entering the following command into a PostgreSQL interactive terminal results in an error:
1 Answer
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Can I change a column from NOT NULL to NULL without dropping it?
... I tried with alter column and it didn't work with the latest mysql server. I tried with modify column and it worked. Strange...
– Kostas Andrianos
Aug 19 '17 at 15:29
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