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Which are more performant, CTE or temporary tables?
...y to other constructs that can also be used as inline table expressions in SQL Server. Derived tables, Views, and inline table valued functions. Note that whilst BOL says that a CTE "can be thought of as temporary result set" this is a purely logical description. More often than not it is not materl...
Copy a table from one database to another in Postgres
...it directly to the target database:
pg_dump -t table_to_copy source_db | psql target_db
Note: If the other database already has the table set up, you should use the -a flag to import data only, else you may see weird errors like "Out of memory":
pg_dump -a -t my_table my_db | psql target_db
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Read data from SqlDataReader
I have a SQL Server 2008 database and I am working on it in the backend. I am working on asp.net/C#
13 Answers
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SQL Server indexes - ascending or descending, what difference does it make?
When you create an index on a column or number of columns in MS SQL Server (I'm using version 2005), you can specify that the index on each column be either ascending or descending. I'm having a hard time understanding why this choice is even here. Using binary sort techniques, wouldn't a lookup be ...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
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This is a role model answer. In particular, working with SQL and SQL Server can be weird, and this explains things in a very clear, layman's manner, while still being fairly informative. It doesn't sound like something being communicated between two database specialists, which a L...
Postgres: SQL to list table foreign keys
Is there a way using SQL to list all foreign keys for a given table? I know the table name / schema and I can plug that in.
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SQLAlchemy ORDER BY DESCENDING?
How can I use ORDER BY descending in a SQLAlchemy query like the following?
6 Answers
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Count number of records returned by group by
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I know this is a SQL-Server question, but for reference: This does not work on DB/2 (in my case on IBM iSeries). See my comment at Thomas´s answer
– Bjinse
Dec 13 '12 at 8:05
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What is the difference between “INNER JOIN” and “OUTER JOIN”?
...ur FROM A LEFT OUTER JOIN B ON A.Colour = B.Colour AND B.Colour = 'Green'
SQL Fiddle
See these examples run live at SQLFiddle.com.
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SQLite: How do I save the result of a query as a CSV file?
I'm new to SQLite. Is there a way I can export the results of a query into a CSV file?
6 Answers
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