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Adding 'serial' to existing column in Postgres

...int, b text); CREATE TABLE bar (a serial, b text); INSERT INTO foo (a, b) SELECT i, 'foo ' || i::text FROM generate_series(1, 5) i; INSERT INTO bar (b) SELECT 'bar ' || i::text FROM generate_series(1, 5) i; -- blocks of commands to turn foo into bar CREATE SEQUENCE foo_a_seq; ALTER TABLE foo ALTER...
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Select arrow style change

I'm trying to replace the arrow of a select with a picture of my own. I'm including the select in a div with the same size, I set the background of the select as transparent and I'm including a picture(with the same size as the arrow) in the right top corner of the div as background. ...
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Cannot truncate table because it is being referenced by a FOREIGN KEY constraint?

... IF OBJECT_ID('tempdb..#FKs') IS NOT NULL DROP TABLE #FKs -- GET FKs SELECT ROW_NUMBER() OVER (ORDER BY OBJECT_NAME(parent_object_id), clm1.name) as ID, OBJECT_NAME(constraint_object_id) as ConstraintName, OBJECT_NAME(parent_object_id) as TableName, clm1.name as ColumnName...
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Insert multiple rows WITHOUT repeating the “INSERT INTO …” part of the statement?

... INSERT INTO dbo.MyTable (ID, Name) SELECT 123, 'Timmy' UNION ALL SELECT 124, 'Jonny' UNION ALL SELECT 125, 'Sally' For SQL Server 2008, can do it in one VALUES clause exactly as per the statement in your question (you just need to add a comma to separate eac...
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Remove an entire column from a data.frame in R

...=4:6) to remove just the a column you could do Data <- subset( Data, select = -a ) and to remove the b and d columns you could do Data <- subset( Data, select = -c(d, b ) ) You can remove all columns between d and b with: Data <- subset( Data, select = -c( d : b ) As I said above...
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How can prepared statements protect from SQL injection attacks?

...ample shows it (all examples in PHP/Mysql): $expected_data = 1; $query = "SELECT * FROM users where id=$expected_data"; will produce a regular query SELECT * FROM users where id=1 while this code $spoiled_data = "1; DROP TABLE users;" $query = "SELECT * FROM users where id=$spoiled_da...
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Get records with max value for each group of grouped SQL results

... There's a super-simple way to do this in mysql: select * from (select * from mytable order by `Group`, age desc, Person) x group by `Group` This works because in mysql you're allowed to not aggregate non-group-by columns, in which case mysql just returns the first row. T...
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jQuery remove options from select

I have a page with 5 selects that all have a class name 'ct'. I need to remove the option with a value of 'X' from each select while running an onclick event. My code is: ...
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Inserting data into a temporary table

... INSERT INTO #TempTable (ID, Date, Name) SELECT id, date, name FROM physical_table share | improve this answer | follow | ...
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Datatype for storing ip address in SQL Server

...VARCHAR(15)) RETURNS BINARY(4) AS BEGIN DECLARE @bin AS BINARY(4) SELECT @bin = CAST( CAST( PARSENAME( @ip, 4 ) AS INTEGER) AS BINARY(1)) + CAST( CAST( PARSENAME( @ip, 3 ) AS INTEGER) AS BINARY(1)) + CAST( CAST( PARSENAME( @ip, 2 ) AS INTEGER) AS BINARY(1)) ...