Sql updating table based another table

Because of this indeterminacy, referencing other tables only within sub-selects is safer, though often harder to read and slower than using a join. [1] Set the value of column C1 in table T to 1, only in those rows where the value of column C2 is "a".This is one of the most interesting questions I keep on getting on this email and I find that not everyone knows about it. Our requirement is that we have Table2 which has two rows where Col1 is 21 and 31.On the left-hand side of the window that pops up, choose the “SQL Editor” section.

We must be very careful when using COMMIT and ROLLBACK – in other words, when we are changing the state of our data set.For any SQL Server Performance Tuning Issue send an email at [email protected] is also a Cross Fit Level 1 Trainer (CF-L1) and Cross Fit Level 2 Trainer (CF-L2).After that moment, even if you run the ROLLBACK clause 20 times, you can get to the state of only the last COMMIT.You cannot restore data to a state corresponding to an earlier COMMIT.

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When you look at this it looks very simple but when we try to think the solution, I have seen developers coming up with many different solutions for example sometime they write cursor, table variables, local variables etc.

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