大约有 6,000 项符合查询结果（耗时：0.0190秒） [XML]
How do I import CSV file into a MySQL table?
...normalized events-diary CSV from a client that I'm trying to load into a MySQL table so that I can refactor into a sane format. I created a table called 'CSVImport' that has one field for every column of the CSV file. The CSV contains 99 columns , so this was a hard enough task in itself:
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How can I append a string to an existing field in MySQL?
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You need to use the CONCAT() function in MySQL for string concatenation:
UPDATE categories SET code = CONCAT(code, '_standard') WHERE id = 1;
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How can I convert tabs to spaces in every file of a directory?
...bs everywhere in a file.
Will take a long time if you happen to have a 5GB SQL dump in this directory.
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Select row with most recent date per user
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Query:
SQLFIDDLEExample
SELECT t1.*
FROM lms_attendance t1
WHERE t1.time = (SELECT MAX(t2.time)
FROM lms_attendance t2
WHERE t2.user = t1.user)
Result:
| ID | USER | TIME | IO |
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Find the last element of an array while using a foreach loop in PHP
I am writing a SQL query creator using some parameters. In Java, it's very easy to detect the last element of an array from inside the for loop by just checking the current array position with the array length.
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Detect if a NumPy array contains at least one non-numeric value?
...arly oddness with NAN and boolen NULL is true in many languages, including SQL (where NULL=NULL is never true).
– user48956
Oct 4 '17 at 18:08
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Increment a value in Postgres
...olumns, 'name' and 'total', and Bill had a total of 203, what would be the SQL statement I'd use in order to move Bill's total to 204?
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Get bitcoin historical data [closed]
...rom a flat file, which most databases allow you to use (for instance, with SQL Server you can do a BULK INSERT from a CSV file).
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How can I get the domain name of my site within a Django template?
...each RequestContext will call get_current_site(), and therefore execute an SQL query. The wrapper makes sure the variable is only evaluated when it's actually used in the template.
– vdboor
Aug 14 '14 at 9:51
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Purge or recreate a Ruby on Rails database
...acks GTD app db:migrate didn't work. I had to do db:reset when moving from Sqlite3 to Postgres.
– labyrinth
Mar 29 '12 at 4:06
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