What Does Distinct Means But in others e g x doesn t work nor does x NOT IN a b it s a problem Empty strings are a thing and they are not the same thing as SQL s notorious NULL In fact I d even go as far as saying that Oracle s behaviour is useful almost only with concatenation where indeed the standard behviour is less useful
Dim query From city In myCountry Cities From street In city Streets Select New StreetInfo With Name street Name Index street Index Distinct Now I remarqued that if I have multiple identical streets having the same Name and Index the StreetInfo list contains all that duplicates The DISTINCT clause operates on the values of the expressions present in the SELECT clause If row 1 is processed first then A B is placed in the result set and it is associated with row 1 Then when row 2 is processed the values of the SELECT expressions produce the record A B that is already in the result set
What Does Distinct Means
What Does Distinct Means
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DISTINCT does NOT eliminate rule out Nulls However Aggregate Functions IGNORE Null Values As others have mentioned so if you want to count all NON NULL DISTINCT Values use the code you mentioned SELECT COUNT DISTINCT columnName If you want to count all nulls as another value you can do that 1 of 2 ways Distinct is not required in your SQL as you are going to get only result count without group by clause returns count of all rows within that table Hence try this select count from table1 Distinct is used for finding distinct values from a group of values say you have table1 with column1 as Column1 a a b b a c
The documentation of the method does not guarantee that this specific order is the one chosen In practice this specific order is chosen But by unordered the documentation means that any order can be chosen by the implementation Sometimes it is more efficient to not preserve the original order CREATE OR REPLACE TABLE finance fraud data model AS SELECT FROM finance fraud data sample EXCEPT distinct select from finance fraud data test I am trying to understand what is being retrieved or ignored from the finance fraud data test table or what is the main finance fraud data model made up of when it comes to the two other tables
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However count distinct means number of values when duplicates have been removed A A A On Linq2Objects you can stay on the internal source code for Distinct which makes one assume the original order is preserved However for other providers that resolve to some kind of SQL for example that isn t neccessarily the case as an ORDER BY statement usually comes after any aggregation such as Distinct So if your code is this
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But in others e g x doesn t work nor does x NOT IN a b it s a problem Empty strings are a thing and they are not the same thing as SQL s notorious NULL In fact I d even go as far as saying that Oracle s behaviour is useful almost only with concatenation where indeed the standard behviour is less useful
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Dim query From city In myCountry Cities From street In city Streets Select New StreetInfo With Name street Name Index street Index Distinct Now I remarqued that if I have multiple identical streets having the same Name and Index the StreetInfo list contains all that duplicates
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