4) What is a Literal? Give an example of where it can be used?Ī Literal is a string that can contain a character, a number, or a date that is included in the SELECT list and that is not a column name or a column alias. “ AS” Keyword before the alias name makes the SELECT clause easier to read.įor example Select emp_name AS name from employee (Here AS is a keyword and “name” is an alias). Enclose the alias in double quotation marks (“ “) to make it case-sensitive. By default column, alias headings appear in upper case. Transaction Control Statements: COMMIT, ROLLBACK, SAVEPOINTĭata Manipulation Language (DCL): GRANT, REVOKEĪlias is a user-defined alternative name given to the column or table. There are 5 different types of SQL statements.ĭata Manipulation Language (DML): INSERT, UPDATE, DELETE, MERGEĭata Definition Language (DDL): CREATE, ALTER, DROP, RENAME, TRUNCATE. SQL is a language used to communicate with the server to access, manipulate, and control data. SQL stands for Structured Query Language. Oracle PL SQL Interview Questions for Beginners 1) What is the difference between PL SQL and SQL?Ģ) What is SQL and also describe types of SQL statements?
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