Khaitan

Khaitan

1549936686

Get only one row if is not equals

i have my table:

ID | NAME | TYPE             
1  | A    | 1    
2  | A    | NULL  
3  | B    | NULL  
4  | C    | 2    
5  | D    | NULL 
6  | D    | NULL   

and i want to for example if i choose Type 1 i get the row but i want all the null values from the other.

ID | NAME | TYPE             
1  | A    | 1    
3  | B    | NULL  
5  | D    | NULL 
6  | D    | NULL   

sometime like this. i try with union but i get repeat A | NULL

thx for all

#sql #sql-server

What is GEEK

Buddha Community

Riley Lambert

1549941846

ou seem to want:

select t.*
from t
where type = 1
union all
select t.*
from t
where type is null and
      not exists (select 1 from t t2 where t2.name = t.name and t2.type = 1);

You don’t actually need the union all:

select t.*
from t
where type = 1 or
      (type is null and
       not exists (select 1 from t t2 where t2.name = t.name and t2.type = 1)
      );

How to Get Current URL in Laravel

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Siphiwe  Nair

Siphiwe Nair

1623709440

Big Data Follows One Farm, One Data Set Rule Overwhelming To Farmers

The digital world has transformed several businesses with significant impacts on data analytics. The vast type of knowledge available to view is expected to exceed 44 zettabytes by 2022 and has proved to have been of tremendous benefit to several sectors and big companies.

A few companies that get an advantage from big data consulting services are banking, airline, tourism, hospitality, automotive, athletic, entertainment industries, and even the farming sector. The collection could go on and on through big data could be a tremendous possession of an industry expert. By the end of 2021, the company’s acceptance of big data will go to 53 percent. Agriculture struggles to be symbiotic towards the business in the clarification of the information produced.

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Macey  Legros

Macey Legros

1599641040

Java String Equals Example | String equals() In Java

In Java, objects of strings are immutable, so that means we cannot once the string is created. Now, if we have two strings and we want to compare them if they are the same or not, then we can use the equals()method.

Java String Equals Example

Java String equals() method compares the two given strings based on the content of a string.

If any character is not matched, then it returns false and if all characters are matched, it returns true.

  1. Java String equals() method overrides an Object class equals() method implementation.
  2. Java String is immutable, checking the equality of string to another object should be done using equals() method rather than == operator.
  3. String equals() method always returns a boolean value; it doesn’t throw any exceptions.
  4. The result of the equals() method is true if and only if an argument is not null, it’s the String object, represents the same sequence of characters as this string.

See the following syntax.

string1.equals(string2);

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What is the difference between = (single equal to) and == (double equal to)?

What is the difference between = (single equal to) and == (double equal to)?

  • The = (single equal to) is use to assign the value on the right to a variable
    on the left.

  • The == (double equal to) is use to compare to two values.

Explained By DDSRY

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Lisa joly

Lisa joly

1624557600

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