Which of the following is true? (refer to the tables in the JustLee Books database)a. If you truncate a table, you can’t add new data to the table.b. If you change the default value of an existing column, all existing rows containing a NULL value in the same column are set to the new DEFAULT value.c. If you delete a column from a table, you can’t add a column to the table with the same name as the previously deleted column.d. If you add a column to an existing table, it’s always added as the last column of the table.
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.
Which of the following is true? (refer to the tables in the JustLee Books
a. If you truncate a table, you can’t add new data to the table.
b. If you change the default value of an existing column, all existing rows containing a NULL value in the same column are set to the new DEFAULT value.
c. If you delete a column from a table, you can’t add a column to the table with the same name as the previously deleted column.
d. If you add a column to an existing table, it’s always added as the last column of the table.
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