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
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) );
In this small post we will see how to get current url in laravel, if you want to get current page url in laravel then we can use many method such type current(), full(), request(), url().
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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.
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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() 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.
See the following syntax.
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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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