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How to search a specific value in all tables (PostgreSQL)?
...e to search every column of every table for a particular value in PostgreSQL?
8 Answers
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must appear in the GROUP BY clause or be used in an aggregate function
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Yes, this is a common aggregation problem. Before SQL3 (1999), the selected fields must appear in the GROUP BY clause[*].
To workaround this issue, you must calculate the aggregate in a sub-query and then join it with itself to get the additional columns you'd need to show...
Get table names using SELECT statement in MySQL
In MySQL, I know I can list the tables in a database with:
12 Answers
12
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SELECT DISTINCT on one column
Using SQL Server, I have...
7 Answers
7
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Replace Default Null Values Returned From Left Outer Join
I have a Microsoft SQL Server 2008 query that returns data from three tables using a left outer join. Many times, there is no data in the second and third tables and so I get a null which I think is the default for left outer join. Is there a way to replace the default values in the select stateme...
Should I use the datetime or timestamp data type in MySQL?
... you recommend using a datetime or a timestamp field, and why (using MySQL)?
39 Answers
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Left Join With Where Clause
...rry about JOIN/WHERE in the main query.
Sometimes, this works faster in MySQL, but compare it against the LEFT JOIN form to see what works best for you.
SELECT s.*, c.value
FROM settings s
LEFT JOIN character_settings c ON c.setting_id = s.id AND c.character_id = '1'
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Force Java timezone as GMT/UTC
...se column does not keep timezone information.
The java.util.Date and java.sql.Date classes store the actual time (milliseconds) in UTC. To format these on output to another timezone, use SimpleDateFormat. You can also associate a timezone with the value using a Calendar object:
TimeZone tz = TimeZ...
MySQL Query to select data from last week?
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@Graph Yes, The SQL script above will be like that: SELECT id FROM tbl WHERE DATE > DATE_SUB(DATE(NOW()), INTERVAL DAYOFWEEK(NOW())+6 DAY) AND DATE <= DATE_SUB(DATE(NOW()), INTERVAL DAYOFWEEK(NOW())-1 DAY)
– Xman...
Is asynchronous jdbc call possible?
...usy/blocked per concurrent request.
If the underlying database drivers (MySql?) offers a means to intercept the socket creation (see SocketFactory) then I imagine it would be possible to build an async event driven database layer on top of the JDBC api but we'd have to encapsulate the whole JDBC be...