In some cases, updating multiple columns in SQL requires more advanced techniques, especially when handling null values, conditional logic, or updating based on data from other tables. When the value of a colum
Cross join refers to the Cartesian product of two tables. It produces cross product of two tables. The above query can be written using CROSS JOIN clause. A Cartesian product result table is normally not very useful. In fact, such a result table can be terribly misleading. If you execute ...
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Age Bucket in sql Age calculation in report builder query Aggregated CASE expressions versus the PIVOT operator… Is one better than the other? Aging Report SQL Query Alias all columns in a given table Alias column with variable value in SQL Script All ...
In some cases, you might want to run multiple instances of MySQL on a single machine. You might want to test a new MySQL release while leaving an existing production setup undisturbed. Or you might want to give different users access to differentmysqldservers that they manage themselves. (For...
20.What will be the result of a NATURAL JOIN between two tables EMPLOYEES and DEPARTMENT as given in the query below? (Consider the table structures as given)SQL> DESC employees Name Null? Type --- --- --- EMPLOYEE_ID NOT NULL NUMBER(6) FIRST_NAME VARCHAR2(20) LAST_NAME NOT NULL ...
This might be the instance that is being saved, or it might be an instance that is being added in a many-to-many relation. In some cases, no instance hint will be provided at all. The router checks for the existence of an instance hint, and determine if that hint should be used to...
We can define a custom method in our ProductRepository interface: public interface ProductRepository extends MongoRepository<Product, String> { @Query("{ 'name': ?0, 'price': { $gt: ?1 }, 'category': ?2, 'available': ?3 }") List<Product> findProductsByNamePriceCategoryAndAvailability(St...
But in my defense, in all examples the case expression itself is actually returning a single column value. You are then processing this value, or in some cases completely ignoring this, to get the result. The case statement itself is not allowing you to pass multiple columns back. In a se...
A-sql-executionRelating to SQL execution.C-bugCode not up to spec/doc, specs & docs deemed correct. Solution expected to change code/behavior.S-3-erroneous-edge-caseDatabase produces or stores erroneous data without visible error/warning, in rare edge cases.T-kvKV TeamT-sql-queriesSQL Quer...