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How to map calculated properties with JPA and Hibernate
...ntioned, @Formula is perfect for this when using Hibernate. You can use an SQL fragment:
@Formula("PRICE*1.155")
private float finalPrice;
Or even complex queries on other tables:
@Formula("(select min(o.creation_date) from Orders o where o.customer_id = id)")
private Date firstOrderDate;
Wher...
'IF' in 'SELECT' statement - choose output value based on column values
...(type = 'P', amount, amount * -1) as amount
FROM report
See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html.
Additionally, you could handle when the condition is null. In the case of a null amount:
SELECT id,
IF(type = 'P', IFNULL(amount,0), IFNULL(amount,0) * -1) as a...
find() with nil when there are no records
...hen you pass a hash as 'x' to Something.find_by(id: x) it would create a SQL statement with all the attribute/value pairs of the hash as part of the WHERE clause. Looks like a Rails bug to me.
– Tilo
May 24 '17 at 21:44
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Dropping Unique constraint from MySQL table
How can I drop the "Unique Key Constraint" on a column of a MySQL table using phpMyAdmin?
10 Answers
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Extracting the last n characters from a string in R
...n I get the last n characters from a string in R?
Is there a function like SQL's RIGHT?
15 Answers
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How to select only date from a DATETIME field in MySQL?
I have a table in the MySQL database that is set up with DATETIME . I need to SELECT in this table only by DATE and excluding the time.
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Execute stored procedure with an Output parameter?
... stored procedure that I am trying to test. I am trying to test it through SQL Management Studio. In order to run this test I enter ...
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MySQL selecting yesterday's date
...ould otherwise require a cumbersome and wordy case statement, is that in mysql boolean values are 1 for true and 0 for false, so summing a condition effectively counts how many times it's true. Using this pattern can neaten up your SQL code.
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How to perform OR condition in django queryset?
I want to write a Django query equivalent to this SQL query:
4 Answers
4
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How do I free my port 80 on localhost Windows?
...t 80 in windows.
IIS
World Wide Web Publishing service
IIS Admin Service
SQL Server Reporting services
Web Deployment Agent Service
Stop above applications if running and check!!!
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