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How do I find a “gap” in running counter with SQL?
I'd like to find the first "gap" in a counter column in an SQL table. For example, if there are values 1,2,4 and 5 I'd like to find out 3.
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Is there documentation for the Rails column types?
...tatype your database of choice requires (i.e. serial primary key in postgreSQL). Its use is somewhat complicated and not recommended.
Use model and migration constraints (like validates_uniqueness_of and add_index with the :unique => true option) instead to simulate primary key functionality on o...
SQL - Select first 10 rows only?
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In SQL server, use:
select top 10 ...
e.g.
select top 100 * from myTable
select top 100 colA, colB from myTable
In MySQL, use:
select ... order by num desc limit 10
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How to avoid variable substitution in Oracle SQL Developer with 'trinidad & tobago'
When I try to execute this statement in Oracle SQL Developer 2.1 a dialog box "Enter Substitution Variable" pops up asking for a replacement value for TOBAGO ,
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How do I escape reserved words used as column names? MySQL/Create Table
...d one problem is a class may have a field name key which is a reserved MySQL keyword. How do I escape it in a create table statement? (Note: The other problem below is text must be a fixed size to be indexed/unique)
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What is the use of the @Temporal annotation in Hibernate?
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how I can store in MySql DB in the format as yyyy-MM-dd
– Shantaram Tupe
Feb 10 '17 at 6:54
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Count(*) vs Count(1) - SQL Server
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In SQL Server, these statements yield the same plans.
Contrary to the popular opinion, in Oracle they do too.
SYS_GUID() in Oracle is quite computation intensive function.
In my test database, t_even is a table with 1,000,000...
How can I select from list of values in SQL Server
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Available only on SQL Server 2008 and over is row-constructor in this form:
You could use
SELECT DISTINCT * FROM (VALUES (1), (1), (1), (2), (5), (1), (6)) AS X(a)
Many wrote about, among them:
[MS official] https://docs.microsoft.com/en...
How to request a random row in SQL?
... request a random row (or as close to truly random as is possible) in pure SQL?
28 Answers
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What's the best way to store co-ordinates (longitude/latitude, from Google Maps) in SQL Server?
I'm designing a table in SQL Server 2008 that will store a list of users and a Google Maps co-ordinate (longitude & latitude).
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