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With regards to SQL and queries, whats the difference between an in-memory table, temp table and a pivot table?
Started by on , 3 posts by 3 people.  
Depends....
Alternatively, it's a table-valued variable, declared in a batch or function, with no persistence.
An in-memory table is a table that's been entirely cached, and so doesn't result in any physical (hard disk) reads when queried.
I'm trying to find all the tables below my current node without also including the nested tables. In other words, if I have this, i want to find "yes" and not "no": <table> <!-- outer table - no --> <tr><td> <div> <!--...
Started by on , 6 posts by 6 people.  
I think you want child::table aka table #!/usr/bin/perl -- use strict; use warnings; use HTML; <!-- outer table - no --> <tr><td> <div> <!-- *** context node ) ); } ## end sub HTML::Element::addressx for....
List the differences between the following MySql commands. drop table tablename ; truncate table tablename ; delete from tablename where 1; Also from your experiences please tell me typical usage scenario for each.
Started by on , 4 posts by 4 people.  
I check for that....
I would drop the table if I didn't need it anymore "Truncate operations drop and re-create the table, which is much faster than deleting rows one by one, particularly as a boolean value.
Drop is deleting the table.
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I have table A and table B, same schemas. I want to insert certain rows from table A into table B. For example, insert into table B all rows from table A with column 'abc' > 10. Couldn't figure out how to do it
Started by on , 5 posts by 5 people.  
To do it this way : create table temp_B as select * from A where abc > 10 union select * from B; drop table B; rename temp_B to B; If you have to insert millions+ rows, you could win several hours.
First, I know that the sql statement to update table_a using values from table_b is in the form of: Oracle: UPDATE table_a SET (col1, col2) = (SELECT cola, colb FROM table_b WHERE table_a.key = table_b.key) WHERE EXISTS (SELECT * FROM table_b WHERE table...
Started by on , 3 posts by 3 people.  
How the engine determines what to do is based factors like indexes and statistics, the engine will have to to a "table scan" (roughly the equivalent of "iterate") to find the right sense that I feel stupid for using....
Ten rows in table b.
How do you create a temporary table exactly like a current table in a stored procedure?
Started by on , 5 posts by 5 people.  
Select * into #temp_table from current_table_in_stored_procedure #temp_table - locally temp ##temp_table - globally temp select top 0 * into #temp_table from current_table_in_stored_procedure to have empty ....
Hi, I need to drop a table and make a new one. If I drop the table and the table doesn't exist, I get an error How can I check if the table exists? I'm working on Oracle 11g Thanks in advance.
Started by on , 6 posts by 6 people.  
Something like select count(*) from user_tables where table_name= :table name or select count(*) from dba_tables where owner = :table owner and table_name = :table name or a heavy-handed alternative: begin....
I new to MySQL. I would like to copy the content of one table to another table within the same database. Basically, I would like to insert to a table from another table. Is there easy way of doing this? thanks for any help
Started by on , 5 posts by 5 people.  
INSERT INTO TARGET_TABLE SELECT * FROM SOURCE_TABLE EDIT: or if the tables have different structures you can also: INSERT INTO TARGET_TABLE (col1,col2) SELECT col1,col2 FROM SOURCE_TABLE If the table doesn't ....
Hi Can somebody explain me the difference between Temp table and table variable in SQL server 2005?
Started by on , 5 posts by 5 people.  
There is a performance difference that favors table variables because temporary tables....
Hope these helps: http://databases.aspfaq.com/database/should-i-use-a-temp-table-or-a-table There are few differences you can check them here .
What is main difference between INSERT INTO table VALUES .. and INSERT INTO table SET ? Example: INSERT INTO table (a, b, c) VALUES (1,2,3) INSERT INTO table SET a=1, b=2, c=3 And what about performance of these two?
Started by on , 3 posts by 3 people.  
I think the extension is intended is "UPDATE table ....
SELECT form inserts rows selected from another table or tables.
VALUES ...
The INSERT ...
Refman/6.0/en/insert.html says: INSERT inserts new rows into an existing table.
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