True/False 5. In an AND criterion, the overall criterion is true if either of the individual criteria is true. 6. The concept of grouping means that statistics will be calculated for individual records. 7. In many cases, you will need to create queries to select data from more than one table. To do so, it is necessary to join the tables based on matching fields in corresponding columns.
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
True/False
5. In an AND criterion, the overall criterion is true if either of the individual criteria is true.
6. The concept of grouping means that statistics will be calculated for individual records.
7. In many cases, you will need to create queries to select data from more than one table. To do so, it is
necessary to join the tables based on matching fields in corresponding columns.
8. Matrix algebra is a theoretical way of manipulating a
9. The union of tables A and B is a table containing all rows that are in either table A or table B or in both table A and table B.
10. The intersection of two tables A and B is the set of all rows that are in table A but that are not in table B.
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