大约有 7,400 项符合查询结果（耗时：0.0308秒） [XML]
Laravel orderBy on a relationship
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If you use mysql strict mode, which is default in Laravel 5.4 ,f.ex you'll receive SQLSTATE[42000]: Syntax error or access violation: 1140 Mixing of GROUP columns ...
– Sabine
Feb 18 '17 at 15:15
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Computed / calculated / virtual / derived columns in PostgreSQL
...s defined in the SQL standard and implemented by some RDBMS including DB2, MySQL and Oracle. Nor the similar "computed columns" of SQL Server.
STORED generated columns are introduced with Postgres 12. Trivial example:
CREATE TABLE tbl (
int1 int
, int2 int
, product bigint GENERATED ALWAYS...
Why should I use document based database instead of relational database?
... my schema, I am constantly frustrated by having to maintain the schema in MySQL/SQLite. While I've not done too much with CouchDB yet, I do like how simple it is to evolve the schema during the RAD process.
A case where you might not want to use a non-relational database is when you have a lot of ...
How to hide soft keyboard on android after clicking outside EditText?
...just set that logic in a ViewGroup.onInterceptTouchEvent(MotionEvent) to a root view.
– Alex.F
Apr 3 '14 at 15:46
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SQLAlchemy: how to filter date field?
..., once it's DateTime or timestamp - it's usually finished with 00:00 (both MySQL & PostgreSQL do this). More generic solution is not to cast, but to set the date you are sending to it's .endOfDay() so you actually send 1988-01-17 23:59:59 to the database compare :)
– jave.w...
Using an image caption in Markdown Jekyll
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That is a great idea! However, site_root is not accepted as a valid variable. When rendered it ends up as src="{{ site.url_root }}....
– orschiro
Oct 14 '13 at 19:48
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Hidden Features of ASP.NET [closed]
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If you place a file named app_offline.htm
in the root of a web application directory, ASP.NET 2.0+ will shut-down the application and stop normal processing any new incoming requests for that application, showing only the contents of the app_offline.htm file for all new req...
Visual Studio Copy Project
...le after opening the copied solution and then rename the assembly name and root namespace in the project properties. It was a lot easier than doing everything manually though.
– Fütemire
Jul 31 '17 at 23:59
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What is a stack trace, and how can I use it to debug my application errors?
... multiple "Caused by" sections. For these, you typically want to find the "root cause", which will be one of the lowest "Caused by" sections in the stack trace. In our case, it's:
Caused by: java.lang.NullPointerException <-- root cause
at com.example.myproject.Book.getId(Book.java:22) &...
Difference between CLOB and BLOB from DB2 and Oracle Perspective?
...es, documents, other)
CLOB is for large text data (text)
Maximum size on MySQL 2GB
Maximum size on Oracle 128TB
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