What does it mean to say that the select statements for two tables are union compatible? Question 17 options: 1) The select clauses for the two tables have exactly the same number of columns with exactly the same column names. 2) All of the columns in the table have exactly the same name. 3) The select clauses for the two tables have exactly the same number of columns with exactly the same data types. 4) We can join them together using the UNION operator, but not using the INTERSECT or MINUS operator.
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.
What does it mean to say that the select statements for two tables are union compatible?
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