Which of the following statements places a shared lock on at least a portion of a table named HOMEWORK10?a. SELECT * FROM homework10 WHERE col2 IS NULL FOR UPDATE;b. INSERT INTO homework10 (col1, col2, col3) VALUES (‘A’, ‘B’, ‘C’);c. UPDATE homework10 SET col3 = NULL WHERE col1 = ‘A’;d. UPDATE homework10 SET col3 = LOWER (col3) WHERE col1 = ‘A’;e. all of the above
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 statements places a shared lock on at least a portion of a table named HOMEWORK10?
a. SELECT * FROM homework10 WHERE col2 IS NULL FOR UPDATE;
b. INSERT INTO homework10 (col1, col2, col3) VALUES (‘A’, ‘B’, ‘C’);
c. UPDATE homework10 SET col3 = NULL WHERE col1 = ‘A’;
d. UPDATE homework10 SET col3 = LOWER (col3) WHERE col1 = ‘A’;
e. all of the above
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