what is the difference between unique and distinct?
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The main difference between unique and distinct is that UNIQUE is a constraint that is used on the input of data and ensures data integrity. While DISTINCT keyword is used when we want to query our results or in other words, output the data.
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A field in a record that holds unique data which identifies that record from all the other records in the file or database. Account number, product code and customer name are typical key fields. As an identifier, each key value must be unique in each record.
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When and where to use GROUP BY and DISTINCT. DISTINCT is used to filter unique records out of the records that satisfy the query criteria. The "GROUP BY" clause is used when you need to group the data and it should be used to apply aggregate operators to each group.
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Essentially, DISTINCT collects all of the rows, including any expressions that need to be evaluated, and then tosses out duplicates. GROUP BY can (again, in some cases) filter out the duplicate rows before performing any of that work.
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3 Answers. Well group by and distinct has its own use. Distinct is used to filter unique records out of the records that satisfy the query criteria. Group by clause is used to group the data upon which the aggregate functions are fired and the output is returned based on the columns in the group by clause.
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why 1 is called a unique number. 1 is called a unique number because it is neither a prime number nor a composite number. It has only one factor, i.e, the number itself; and to be a composite number also the number must have two factors, i.e, 1 and the number; and a prime number also must have more than two factors.
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Key Differences Between Primary key and Unique key: Primary key will not accept NULL values whereas Unique key can accept one NULL value. ... A Clustered index automatically created when a primary key is defined whereas Unique key generates the non-clustered index.
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Unique Key. ... Each table can have more than one Unique Constraint. By default, Unique key is a unique non-clustered index. Unique Constraint can not be related with another table's as a Foreign Key.
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As nouns the difference between duplicate and copy is that duplicate is one that resembles or corresponds to another; an identical copy while copy is the result of copying (confer original); an identical duplication.
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The 'Unique ID' field is a setting which prevents the same value from being used in multiple records for any specific field. External IDs are often created with the 'Unique ID' setting so that the External IDs will be unique to each record.
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The Excel UNIQUE function can extract a list of distinct values, or a list of values that only occur once, i.e. unique values. It can return a unique or distinct list from one column or from multiple columns. array is the range or array you want the unique values returned from.
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To differentiate is to show or find the difference between things which are compared. It simply means that they are not the same, but doesn't qualify them as being unique and possibly not related. Distinguish means unique, whereas differentiate means difference. Example: Dave can't differentiate between the two sofas.
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Given distinct points A and B, they determine a unique ray with initial point A. As two points define a unique line, this ray consists of all the points between A and B (including A and B) and all the points C on the line through A and B such that B is between A and C.
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As adjectives the difference between unique and unusual is that unique is (not comparable) being the only one of its kind; unequaled, unparalleled or unmatched while unusual is unlike what is expected; differing in some way from the norm.
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UUID is a term that stands for Universal Unique Identifier. Similarly, GUID stands for Globally Unique Identifier. So basically, two terms for the same thing. They can be used, just like a product number, as a unique reference for an academic standard or content title.
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GROUP BY lets you use aggregate functions, like AVG , MAX , MIN , SUM , and COUNT . On the other hand DISTINCT just removes duplicates. This will give you one row per department, containing the department name and the sum of all of the amount values in all rows for that department.
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If someone says that you are unique, that would be either a good or bad thing. From what I see in my society, if a guy says that you are unique, that is a good thing. It means that you have valuable mind, logic, way of thinking, or talent which everyone likes.