大约有 9,000 项符合查询结果（耗时：0.0190秒） [XML]
select count(*) from table of mysql in php
I am able to get both the value and row of the mysql query result.
18 Answers
18
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String.Join method that ignores empty strings?
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To do it in .NET 2.0 (no LINQ), e.g. for SQL-Server ReportingServices without having to write a function for it:
VB.NET
Dim a As String = "", b As String = "b", c As String = "", d As String = "d", e As String = ""
Dim lala As String = String.Join(" / ", String.J...
Best practices for in-app database migration for Sqlite
I am using sqlite for my iphone and I anticipate the database schema might change over time. What are the gotchas, naming conventions and things to watch out for to do a successful migration each time?
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generate days from date range
...portable technique that works with most databases with minor adjustments.
SQL Fiddle example returning 1,000 days
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Why unsigned integer is not available in PostgreSQL?
...s the difference between tinyint, smallint, mediumint, bigint and int in MySQL? ) and realized that PostgreSQL does not support unsigned integer.
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Select rows which are not present in other table
I've got two postgresql tables:
4 Answers
4
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Advantages and disadvantages of GUID / UUID database keys
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Hear hear! Love your SQL comparison page btw. Extremely useful. The only thing I miss is a changelog.
– Henrik Gustafsson
Sep 16 '08 at 20:40
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Can you use an alias in the WHERE clause in mysql?
...ll not work, in which case you'll need to use a HAVING clause.
From the MySQL Manual:
It is not allowable to refer to a
column alias in a WHERE clause,
because the column value might not yet
be determined when the WHERE clause
is executed. See Section B.1.5.4,
“Problems with Column...
is of a type that is invalid for use as a key column in an index
... on maximum index row size. technet.microsoft.com/en-us/library/ms176089(v=sql.100).aspx
– Daniel Renshaw
May 15 '14 at 11:50
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Psql list all tables
I would like to list all tables in the liferay database in my PostgreSQL install. How do I do that?
6 Answers
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