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suppose in my table 10 rows are there , i want to update odd
rows salary as 90000 ? how u do it ? any one help me ? what
do we use here cursor-fetch or normal sql ?
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Answer Posted / pandu
Hi Krishna, Actually your answer is ok but i have a small
doubt "he want to update odd rows salary as 9000" but in ur
answer i didn't find the odd rows.how will you divide that
table in odd rows and even rows? kindly tell me.
| Is This Answer Correct ? | 4 Yes | 1 No |
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SET is the ANSI standard for variable assignment, SELECT is not. SET can only assign one variable at a time, SELECT can make multiple assignments at once. If assigning from a query, SET can only assign a scalar value. If the query returns multiple values/rows then SET will raise an error. SELECT will assign one of the values to the variable and hide the fact that multiple values were returned (so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one) When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from it's previous value) As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does give it a slight speed advantage over SET.
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