大约有 6,000 项符合查询结果（耗时：0.0320秒） [XML]
How to include “zero” / “0” results in COUNT aggregate?
I've just got myself a little bit stuck with some SQL. I don't think I can phrase the question brilliantly - so let me show you.
...
How to do an INNER JOIN on multiple columns
...he above solution and go the following error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INNER_JOIN airports to_port ON (to_port.code = flights.tairport) WHERE ' at line 7
– Kir...
Export from sqlite to csv using shell script
I'm making a shell script to export a sqlite query to a csv file, just like this:
5 Answers
...
What is Scala's yield?
...ndrum - Which interestingly enough is the same order in which the original SQL spec outlines. Somewhere along the way the SQL language inverted the order, but it makes complete sense to first describe what you are pulling from followed by what you expect to get out of it.
– Jo...
Get generated id after insert
I'm using the SQLite with Android, and I want to know the best way to get the generated id of the row I inserted.
5 Answers...
How big is too big for a PostgreSQL table?
...,1 as c2,2 as c3
from generate_series(1,90000000) x;
https://wiki.postgresql.org/wiki/FAQ
Limit Value
Maximum Database Size Unlimited
Maximum Table Size 32 TB
Maximum Row Size 1.6 TB
Maximum Field Size 1 GB
Maximum Rows per Table Unlimited
Maximum Columns...
Examples of GoF Design Patterns in Java's core libraries
...nd - TextComponent's Undo/Redo.
Interpreter - RegEx (java.util.regex.) and SQL (java.sql.) API.
Prototype - Not 100% sure if this count, but I thinkg clone() method can be used for this purpose.
share
|
...
What is causing ERROR: there is no unique constraint matching given keys for referenced table?
...
In postgresql all foreign keys must reference a unique key in the parent table, so in your bar table you must have a unique (name) index.
See also http://www.postgresql.org/docs/9.1/static/ddl-constraints.html#DDL-CONSTRAINTS-FK and s...
How to add a line break in C# .NET documentation
...
/// <summary>
/// <para>Get a human-readable variant of the SQL WHERE statement of the search element.</para>
/// Rather than return SQL, this method returns a string with icon-tokens, which
/// could be used to represent the search in a condensed pictogram format.
/// </sum...
PHP function to build query string from array
...
Implode will combine an array into a string for you, but to make an SQL query out a kay/value pair you'll have to write your own function.
share
|
improve this answer
|
...