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Oracle SQL Developer multiple table views
In Oracle SQL Developer , one can list the data in a table using the Data tab when viewing a table. there where can add, delete, edit or just viewing records of table currently viewd
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How to get cumulative sum
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@Franklin Only cost efficient for small tables. Cost grows proportional to the square of the number of rows. SQL Server 2012 allows this to be done much more efficiently.
– Martin Smith
May 18 '13 at 19:57
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Difference between a user and a schema in Oracle?
...nts and purposes.
SCOTT is a schema that includes the EMP, DEPT and BONUS tables with various grants, and
other stuff.
SYS is a schema that includes tons of tables, views, grants, etc etc etc.
SYSTEM is a schema.....
Technically -- A schema is the set of metadata (data dictionary) used by the d...
Java HashMap performance optimization / alternative
...h code as mmyers and rsp suggest is better. In my case my solution is acceptable and I wanted to highlight the fact that the arrays must be sorted for hashCode() to work.
– nash
Nov 19 '09 at 17:00
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How can I search (case-insensitive) in a column using LIKE wildcard?
...n, you can just omit all these tricks: it will work automatically.
ALTER TABLE trees
MODIFY COLUMN title VARCHAR(…) CHARACTER
SET UTF8 COLLATE UTF8_GENERAL_CI.
This will also rebuild any indexes on this column so that they could be used for the queries without leading '%'
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How can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?
My table is:
18 Answers
18
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When should I use a composite index?
For example, I have a homes table:
9 Answers
9
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How to assign an exec result to a sql variable?
...that is returned, you can do the same for all other kinds (didn't check if table possible, but I think yes.) I just tried it for nvarchar(50).
– Mzn
May 18 '14 at 4:39
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Using varchar(MAX) vs TEXT on SQL Server
...hould use a Full Text Index.
LIKE is simpler to implement and is often suitable for small amounts of data, but it has extremely poor performance with large data due to its inability to use an index.
share
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How do I force Postgres to use a particular index?
...meters. See:
Examining index usage
enable_ parameters
These are not suitable for ongoing production use. If you have issues with query plan choice, you should see the documentation for tracking down query performance issues. Don't just set enable_ params and walk away.
Unless you have a very go...