大约有 43,000 项符合查询结果（耗时：0.0296秒） [XML]
How do I see all foreign keys to a table or column?
...t name, which is required in some cases (e.g. drop contraint):
select
concat(table_name, '.', column_name) as 'foreign key',
concat(referenced_table_name, '.', referenced_column_name) as 'references',
constraint_name as 'constraint name'
from
information_schema.key_column_usage
wher...
Rails 4 LIKE query - ActiveRecord adds quotes
...xpose you to SQL-injection (which is bad). I would suggest you use the SQL CONCAT() function to prepare the string like so:
"name LIKE CONCAT('%',?,'%') OR postal_code LIKE CONCAT('%',?,'%')", search, search)
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Ant: How to execute a command for each file in directory?
...esource property="element" unless:blank="@{list}" >
<concat>@{list}</concat>
<filterchain>
<replaceregex pattern="([^;]*).*" replace="\1" />
</filterchain>
</loadresource>
...
Detect if value is number in MySQL
...
This should work in most cases.
SELECT * FROM myTable WHERE concat('',col1 * 1) = col1
It doesn't work for non-standard numbers like
1e4
1.2e5
123. (trailing decimal)
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im...
How to create a MySQL hierarchical recursive query
...) initialisation
where find_in_set(parent_id, @pv)
and length(@pv := concat(@pv, ',', id))
Here is a fiddle.
Here, the value specified in @pv := '19' should be set to the id of the parent you want to select all the descendants of.
This will work also if a parent has multiple children. Howe...
Can I “multiply” a string (in C#)?
...
In .NET 4 you can do this:
String.Concat(Enumerable.Repeat("Hello", 4))
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Is there any haskell function to concatenate list with separator?
Is there a function to concatenate elements of a list with a separator?
For example:
5 Answers
...
How to combine paths in Java?
...oes have a class FilenameUtils that can do this kind of thing, such as the concat() method.
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Convert array of integers to comma-separated string
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I am using .NET 4.5. I tried to concat the comma separated numbers with a string. I got an error saying "cannot convert string[] to char". So the earlier version worked flawlessly.
– Prasanth G
Jan 30 at 12:49
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How do I append one string to another in Python?
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If you only have one reference to a string and you concatenate another string to the end, CPython now special cases this and tries to extend the string in place.
The end result is that the operation is amortized O(n).
e.g.
s = ""
for i in range(n):
s+=str(i)
used to ...