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Run PostgreSQL queries from the command line
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psql -U username -d mydatabase -c 'SELECT * FROM mytable'
If you're new to postgresql and unfamiliar with using the command line tool psql then there is some confusing behaviour you should be aware of when you've entered an i...
Difference between scaling horizontally and vertically for databases [closed]
I have come across many NoSQL databases and SQL databases. There are varying parameters to measure the strength and weaknesses of these databases and scalability is one of them. What is the difference between horizontally and vertically scaling these databases?
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Recommended SQL database design for tags or tagging [closed]
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+1 Nice to see some NoSQL implementations also.
– Xeoncross
Mar 18 '11 at 16:24
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PL/SQL, how to escape single quote in a string?
In the Oracle PL/SQL, how to escape single quote in a string ? I tried this way, it doesn't work.
4 Answers
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how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
Some SQL servers have a feature where INSERT is skipped if it would violate a primary/unique key constraint. For instance, MySQL has INSERT IGNORE .
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Using an RDBMS as event sourcing storage
If I were using an RDBMS (e.g. SQL Server) to store event sourcing data, what might the schema look like?
6 Answers
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How to call a stored procedure from Java and JPA
...text is this:
JPA and database stored procedures
If you’re a big fan of SQL, you may be
willing to exploit the power of
database stored procedures.
Unfortunately, JPA doesn’t support
stored procedures, and you have to
depend on a proprietary feature of
your persistence provider. However,
you ca...
Get first day of week in SQL Server
...-- Magic convertion of monday to 1, tuesday to 2, etc.
-- irrespect what SQL server thinks about start of the week.
-- But here we have sunday marked as 0, but we fix this later.
SET @DOW = (@DOW + @@DATEFIRST - 1) %7
IF @DOW = 0 SET @DOW = 7 -- fix for sunday
RETURN DATEADD(DD, 1 - @DOW,...
PDO's query vs execute
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query runs a standard SQL statement and requires you to properly escape all data to avoid SQL Injections and other issues.
execute runs a prepared statement which allows you to bind parameters to avoid the need to escape or quote the parameters. ...
SQL WHERE condition is not equal to?
...le of times.. but it didn't seem to work until I realized that DELETE in MySQL does not use the * ..
– Frank Vilea
May 27 '11 at 19:59
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