大约有 40,000 项符合查询结果（耗时：0.0212秒） [XML]
How to make MySQL handle UTF-8 properly
... query/insert into the database
use DEFAULT CHARSET=utf8 when creating new tables
at this point your MySQL client and server should be in UTF-8 (see my.cnf). remember any languages you use (such as PHP) must be UTF-8 as well. Some versions of PHP will use their own MySQL client library, which may no...
LINQ to Entities case sensitive comparison
...lution would be to change the collation of the Name column in the Thingies table to COLLATE Latin1_General_CS_AS which is case sensitive by running this on your SQL Server:
ALTER TABLE Thingies
ALTER COLUMN Name VARCHAR(25)
COLLATE Latin1_General_CS_AS
For more information on the SQL Server Collate...
Can dplyr package be used for conditional mutating?
...for other better ways to handle the problem, here's another way using data.table:
require(data.table) ## 1.9.2+
setDT(df)
df[a %in% c(0,1,3,4) | c == 4, g := 3L]
df[a %in% c(2,5,7) | (a==1 & b==4), g := 2L]
Note the order of conditional statements is reversed to get g correctly. There's no co...
Combining INSERT INTO and WITH/CTE
...e a very complex CTE and I would like to insert the result into a physical table.
3 Answers
...
SQL SELECT WHERE field contains words
...
Rather slow, but working method to include any of words:
SELECT * FROM mytable
WHERE column1 LIKE '%word1%'
OR column1 LIKE '%word2%'
OR column1 LIKE '%word3%'
If you need all words to be present, use this:
SELECT * FROM mytable
WHERE column1 LIKE '%word1%'
AND column1 LIKE '%word2%'
...
Fastest Way to Find Distance Between Two Lat/Long Points
...
Create your points using Point values of Geometry data types in MyISAM table. As of Mysql 5.7.5, InnoDB tables now also support SPATIAL indices.
Create a SPATIAL index on these points
Use MBRContains() to find the values:
SELECT *
FROM table
WHERE MBRContains(LineFromText(CONCAT(
...
Split string in Lua?
... for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
table.insert(t, str)
end
return t
end
.
share
|
improve this answer
|
follow
...
SQL Server: SELECT only the rows with MAX(DATE)
I have a table of data (the db is MSSQL):
11 Answers
11
...
How can I prevent SQL injection in PHP?
...ng "'Sarah'; DELETE FROM employees", and you will not end up with an empty table.
Another benefit of using prepared statements is that if you execute the same statement many times in the same session it will only be parsed and compiled once, giving you some speed gains.
Oh, and since you asked abo...
MongoDB/NoSQL: Keeping Document Change History
...ific entities in a database. I've heard this called row versioning, a log table or a history table (I'm sure there are other names for it). There are a number of ways to approach it in an RDBMS--you can write all changes from all source tables to a single table (more of a log) or have a separate h...