大约有 3,551 项符合查询结果（耗时：0.0202秒） [XML]
Limit a stream by a predicate
...and takeXXX are more popular terms but I can personally live with the more SQL-esque limitXXX and skipXXX. I find this new asymmetry much more confusing than the individual choice of terms... :) (btw: Scala also has drop(int) and take(int))
– Lukas Eder
Jan 8 '...
How to set Sqlite3 to be case insensitive when string comparing?
I want to select records from sqlite3 database by string matching. But if I use '=' in the where clause, I found that sqlite3 is case sensitive. Can anyone tell me how to use string comparing case-insensitive?
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How to see log files in MySQL?
I've read that Mysql server creates a log file where it keeps a record of all activities - like when and what queries execute.
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PostgreSQL LIKE query performance variations
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Pattern matching with LIKE, SIMILAR TO or regular expressions in PostgreSQL
How is LIKE implemented?
Finding similar strings with PostgreSQL quickly
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Setting Objects to Null/Nothing after use in .NET
...d will call .Dispose (MOST Of the time) when their scope ends. However... SQL Connections are one big time when .Dispose() is never optimized-in. There are some types that require explicit attention, so I personally always do things explicitly just so I don't get bitten.
– Su...
MySQL InnoDB not releasing disk space after deleting data rows from table
I have one MySQL table using the InnoDB storage engine; it contains about 2M data rows. When I deleted data rows from the table, it did not release allocated disk space. Nor did the size of the ibdata1 file reduce after running the optimize table command.
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Compress files while reading data from STDIN
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This also works with xz: mysqldump mydb | xz > dbdump.sql.xz
– jeroen
Jul 27 '15 at 18:32
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MySQL - SELECT WHERE field IN (subquery) - Extremely slow why?
...and you only select indexed fields (and things are not too complex) than MySQL will resolve your query using only the indexes, speeding things way up.
General solution for 90% of your IN (select queries
Use this code
SELECT * FROM sometable a WHERE EXISTS (
SELECT 1 FROM sometable b
WHERE a...
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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