Skip to main content

swap two columns values in sql

There are various methods on net to swap values of two column, tried many of them. This one seems to be working for me:

UPDATE table_name SET A=B, B=@temp WHERE (@temp:=A) ;

Some of the queries that don't work are:

1. DECLARE @temp AS varchar(10)
UPDATE Employee1 SET @temp=LastName, LastName=FirstName, FirstName=@temp

2. UPDATE Employee1 SET LastName=FirstName, FirstName=LastName


NOTE: talking about sql query only, not including SAS etc
Labels:

Comments

Post a Comment

Popular posts from this blog

VBA MAcro to generate "table of contents with hyperlinks" automatically in a ppt

VBA MAcro to generate "table of contents with hyperlinks" automatically in a ppt: Function TableOfContent(count As Integer) 'count is the no. of slides in ppt Dim var As Integer Dim i As Integer, scount As Integer Dim strSel As String, strTitle As String, strb As String, strtemp As String, str As String Dim arr() As String Dim index As Integer, indexcount As Integer, slidecount As Integer Dim summary As Slide Dim para As Integer Dim slideOrder() As Integer 'To generate the Table of contents slide ReDim slideOrder(count - 2) 'Collect all the IDs of the selected slides For i = 1 To count - 2 slideOrder(i) = i + 2 Next 'Iterate over the slides in Index order slidecount = UBound(slideOrder) For scount = 1 To slidecount If ActivePresentation.Slides(slideOrder(scount)).Shapes.HasTitle Then 'Build up the ToC Text strTitle = ActivePresentation.Slides(slideOrder(scount)).Shapes("UseCase").TextFrame.TextRange.Text + ": ...
4 comments
Read more

How to do mass insert in redis

A basic and fairly easy way to do mass insert in redis : Command to use: echo -e "$(cat redis_mass_insert.txt)" | redis-cli --pipe Content of file "redis_mass_insert.txt": *3\r\n$5\r\nlpush\r\n$5\r\nu:m:1\r\n$5\r\nvalu1\r\n*3\r\n$5\r\nlpush\r\n$5\r\nu:m:1\r\n$7\r\nmyvalue\r\n Result: All data transferred. Waiting for the last reply... ERR unknown command ' *2' ERR unknown command '$4' ERR wrong number of arguments for 'echo' command ERR unknown command '$20' ERR unknown command ' A�j d�Q;yT��าก �h>' NOTE: command line will show error but in actual the data is transferred and you can check it by entering in redis. Here's the snapshot of the whole procedure: To check how the command is responding: use hexdump -C Command: echo -n $'$3\r\nset\r\n$3\r\nkey\r\n$5\r\nvalue\r\n ' | hexdump -C whose output will be something like 00000000 24 33 0d 0a 73 65 74 0d 0a 24 33 0d 0a 6b 65 79 |$3..set.....
Post a Comment
Read more