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What is the difference between HAVING and WHERE in SQL?
..., CNT=Count(1)
From Address
Where State = 'MA'
Group By City
Gives you a table of all cities in MA and the number of addresses in each city.
This code:
select City, CNT=Count(1)
From Address
Where State = 'MA'
Group By City
Having Count(1)>5
Gives you a table of cities in MA with more than ...
How do I drop a function if it already exists?
...'TF')
)
DROP FUNCTION function_name
GO
If you want to avoid the sys* tables, you could instead do (from here in example A):
IF object_id(N'function_name', N'FN') IS NOT NULL
DROP FUNCTION function_name
GO
The main thing to catch is what type of function you are trying to delete (denoted...
Get top 1 row of each group
I have a table which I want to get the latest entry for each group. Here's the table:
20 Answers
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How to persist a property of type List in JPA?
...
@Please_Dont_Bully_Me_SO_Lords It is less suitable for that use case since your data will be in the database as "foo;bar;foobar". If you want to query for the data then probably an ElementCollection + JoinTable is the way to go for your situation.
–...
List of all index & index columns in SQL Server DB
...This query's getting pretty close to what you're looking for:
SELECT
TableName = t.name,
IndexName = ind.name,
IndexId = ind.index_id,
ColumnId = ic.index_column_id,
ColumnName = col.name,
ind.*,
ic.*,
col.*
FROM
sys.indexes ind
INNER JOIN
sys.i...
How to add a WiX custom action that happens only on uninstall (via MSI)?
...ly on uninstalls - not upgrades, not repairs or modifies. According to the table above I had to use
<Custom Action='CA_ID' Before='other_CA_ID'>
(NOT UPGRADINGPRODUCTCODE) AND (REMOVE="ALL")</Custom>
And it worked!
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Difference between database and schema
... between a Database and a Schema in SQL Server? Both are the containers of tables and data.
5 Answers
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When to use MyISAM and InnoDB? [duplicate]
...s better for beginners. No worries about the foreign relationships between tables.
Faster than InnoDB on the whole as a result of the simpler structure thus much less costs of server resources. -- Mostly no longer true.
Full-text indexing. -- InnoDB has it now
Especially good for read-intensive (se...
What is the best collation to use for MySQL with PHP? [closed]
...names are involved. Depending on the implementation that uses the database tables, this problem could allow malicious users to create a username matching an administrator account.
This problem exposes itself at the very least in early 5.x versions - I'm not sure if this behaviour as changed later.
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Sequelize.js: how to use migrations and sync
...h and the database structure is going to change -- new columns in existing tables as well as new tables, and new associations to existing and new models.
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