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Select first row in each GROUP BY group?
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Informix 12.x also supports window functions (the CTE needs to be converted to a derived table though). And Firebird 3.0 will also support Window functions
– a_horse_with_no_name
Mar 14 '1...
PostgreSQL - fetch the row which has the Max value for a column
... with a Postgres table (called "lives") that contains records with columns for time_stamp, usr_id, transaction_id, and lives_remaining. I need a query that will give me the most recent lives_remaining total for each usr_id
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List of all index & index columns in SQL Server DB
...ir columns.
EDIT: This query's getting pretty close to what you're looking for:
SELECT
TableName = t.name,
IndexName = ind.name,
IndexId = ind.index_id,
ColumnId = ic.index_column_id,
ColumnName = col.name,
ind.*,
ic.*,
col.*
FROM
sys.indexes ind
INNE...
Can an html element have multiple ids?
... and there can only be a
single attribute of type ID per
element. Therefore, in XHTML 1.0 the
id attribute is defined to be of type
ID. In order to ensure that XHTML 1.0
documents are well-structured XML
documents, XHTML 1.0 documents MUST
use the id attribute when defining
fragment ...
How to get cumulative sum
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Edit: this is a generalized solution that will work across most db platforms. When there is a better solution available for your specific platform (e.g., gareth's), use it!
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What's the difference between an id and a class?
...fic element and class when you have a number of things that are all alike. For instance, common id elements are things like header, footer, sidebar. Common class elements are things like highlight or external-link.
It's a good idea to read up on the cascade and understand the precedence assigned to...
Efficiently convert rows to columns in sql server
I'm looking for an efficient way to convert rows to columns in SQL server, I heard that PIVOT is not very fast, and I need to deal with lot of records.
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How to efficiently build a tree from a flat structure?
... property does not necessarily matches with an ID in the structure. Therefore their could be several trees emerging from these objects.
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In an array of objects, fastest way to find the index of an object whose attributes match a search
...lementPos = array.map(function(x) {return x.id; }).indexOf(idYourAreLookingFor);
var objectFound = array[elementPos];
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How to get ID of the last updated row in MySQL?
...nt which will set the value returned by the next call to LAST_INSERT_ID(). For example: UPDATE table SET id=LAST_INSERT_ID(id), row='value' WHERE other_row='blah';. Now, SELECT LAST_INSERT_ID(); will return the updated id. See newtover's answer for more details.
– Joel
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