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What is the difference between T-sql and sql?
T-SQL is Microsoft's version of the generic SQL langauge to be used with, for example, Microsoft SQL Server.
What is the difference between JOIN and Subquery?
A join will join two or more tables together by a field related to both tables (ie, relationship of primary and foreign keys). It is typically easy to understand. A subquery statement involves a SELECT statement that selects particular values from a table. The values that the select query selects is dependant upon the subquery. The subquery itself is another SELECT statement.
Difference between cartesian product and full outer join?
Full outer join will fetch at maximum 'addition of 2 tables' Ex: Table A - 2 rows; Table B - 3 rows. Full outer join will fetch in 2+3 = 5 rows. Where as in Cartesian product will fetch in 'product of 2 tables'. Ex: Table A - 2 rows; Table B - 3 rows. Full outer join will fetch in 2x3 = 6 rows
In SQL what is the function of the union operator?
In SQL, the function of the union operator is to combine the result of two or more select-statements. The union operator is a very useful tool when coding SQL.
How do you find relation between tables in a database?
There are two generic types of relationships that are found between tables in existing databases, those that are explicit (or defined) and those that are implicit (or undefined.) The explicit relationships are defined differently in each database management system, so finding these relationships will depend on which type of database you're using. Typically they can be found via the user interface when designing one of the two tables in the relationship, viewing a relationship option, or by applying SQL against specific system tables. The explicit relationships usually enforce referential integrity in the database, so they are strongly encouraged over implicit relationships, but still implicit relationships will be found in the real world in existing databases. Implicit relationships are relationships where the primary key in one table can be clearly identified in another table as a foreign key, but there is no explicit relationship defined. Because the name of the foreign key matches or is similar in pattern to the the the primary key in the other table, you can imply that there should be a relationship between those tables. These relationships can be identified by foreign key names and by looking at existing SQL and queries in the database system to see what fields tables are joined on.
What does the Join SQL clause feature in computer programming?
A Join SQL clause is a combination of two or more tables from a database. Fields are joined by using data that is present in both tables and are written as an identification for the join.
To join n tables together you need a minmun of how many join conditions in sql?
glue
What does an SQL join combine?
A SQL join clause combines records from two or sometimes more than two tables in to a database. This creates a set that can be used as it is or can be saved as a table.
What is Outer Join SQL used for according to Wikipedia?
Outer Join in SQL is used to retrieve all records from one table and only matching records from another table. It helps to retrieve data from related tables even if there are no matching records in one of the tables.
Feature of rdbms?
It stores data in tables. Tables have rows and column. These tables are created using SQL. And data from these tables are also retrieved using SQL
When you want to extract data from two or more tables you use an query?
When you want to extract data from two or more tables, you can use a SQL JOIN query. By using JOIN clauses, you can combine rows from different tables based on a related column between them. This allows you to retrieve data from multiple tables in a single query.
How do you use SQL?
You use SQL by issuing commands to an SQL server, either directly by you or by a program you are using.
What does SQL CREATE VIEW achieve?
SQL CREATE VIEW achieves the creation of a table or tables in the SQL database. One can then create tables to the purpose they desire and fill them in with information.
How might one use an Inner Join keyword?
The SQL inner join keyword is used to select every row from a table so long as there is a match between the columns of both the tables. This allows many permutations of listings to be made in specified tables.
What is inner join in sql server 2000?
Inner join refers to the join where records that match the where condition in both tables are only fetched. Ex: SELECT A.field1, A.field2, B.field3, B.field4 FROM Table1 A, Table2 B WHERE A.field1 = B.field3 This is an inner join.
What links two tables using a common field in both tables and extracts the relevant data from each?
A join operation links two tables using a common field and extracts relevant data. By specifying the common field in the ON clause of a SQL query, the database can combine rows from both tables based on matching values in that field. This allows data to be retrieved from multiple tables in a single query.
What is the most common type of join in SQL?
Inner Join
