| Analysis of the search query | t sql update multiple rows with different values |
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Top competitors on query "t sql update multiple rows with different values"
http://www.neiland.net/blog/article/inserting-multiple-rows-with-a-single-sql-statement/ Competition: low
Scaling And Locking While it may not be a big problem with 5 rows, if you scale the loop value in the above code up to 10,000 rows (or 100,0000) you suddenly have a different situation. While databases can handle this number of calls you also have to remember that you are locking the table 10,000 times which can slow performance for other users (unless you allow dirty reads)
SQL Server : update multiple rows with different values - Stack Overflow
http://stackoverflow.com/questions/12885468/sql-server-update-multiple-rows-with-different-values Competition: low
ID ItemName 1 Item1 2 Item2 4 Item3 5 Item4 6 Item5 8 Item6 9 Item7 14 Item8 18 Item9 23 Item10 Now, I have another table Table2 and Column2 that I want to update with those 10 items above. ID ItemName 301 NULL 321 NULL 323 NULL 331 NULL 333 NULL 335 NULL 336 NULL 355 NULL 377 NULL 388 NULL So, I a looking for a query where I can update the Table2 and Column2 with those 10 items from Table1, and the result looks like this ID ItemName 301 ITem1 321 ITem2 323 ITem3 331 ITem4 333 ITem5 335 ITem6 336 ITem7 355 ITem8 377 ITem9 388 ITem10 Please help
http://www.karlrixon.co.uk/writing/update-multiple-rows-with-different-values-and-a-single-sql-query/ Competition: low
This is no problem a lot of the time, as the fields to update may all need to be changed to the same value, in which case you might run a query like the following. Rather than setting a field to a particular value, a CASE operator is used to determine which of a set of values is used based on a given condition, in this case if the value of the id field matches the specified id
Scaling And Locking While it may not be a big problem with 5 rows, if you scale the loop value in the above code up to 10,000 rows (or 100,0000) you suddenly have a different situation. While databases can handle this number of calls you also have to remember that you are locking the table 10,000 times which can slow performance for other users (unless you allow dirty reads)
SQL Server : update multiple rows with different values - Stack Overflow
ID ItemName 1 Item1 2 Item2 4 Item3 5 Item4 6 Item5 8 Item6 9 Item7 14 Item8 18 Item9 23 Item10 Now, I have another table Table2 and Column2 that I want to update with those 10 items above. ID ItemName 301 NULL 321 NULL 323 NULL 331 NULL 333 NULL 335 NULL 336 NULL 355 NULL 377 NULL 388 NULL So, I a looking for a query where I can update the Table2 and Column2 with those 10 items from Table1, and the result looks like this ID ItemName 301 ITem1 321 ITem2 323 ITem3 331 ITem4 333 ITem5 335 ITem6 336 ITem7 355 ITem8 377 ITem9 388 ITem10 Please help
This is no problem a lot of the time, as the fields to update may all need to be changed to the same value, in which case you might run a query like the following. Rather than setting a field to a particular value, a CASE operator is used to determine which of a set of values is used based on a given condition, in this case if the value of the id field matches the specified id
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