Outer Joins: Outer Join is used to fetch rows that do not meet the join condition.
The outer join operator is the plus sign ( ), and it is placed on the side of the join that is deficient in information.
COUNT (EXP): Returns the number of non-null values in the column identified by expression. Sub query can be placed in WHERE, HAVING and FROM clause. What are Joins and how many types of Joins are there? To Join ‘N’ tables together, you need a minimum of N-1 Join conditions.
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TO_DATE function format: TO_DATE ( char[, ‘ format_model’] ).
For ex: Select TO_DATE (‘may 24 2007’,’mon dd rr’) from dual; Q. What is a difference between “VERIFY” and “FEEDBACK” command?
Mindmajix offers Advanced Oracle PL SQL Interview Questions 2018 that helps you in cracking your interview & acquire dream career as Oracle PL SQL Developer. What is SQL and also describe types of SQL statements? SQL is a language used to communicate with the server to access, manipulate and control data. Enclose the alias in a double quotation marks (“ “) to make it case sensitive. A 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. Date and character literals must be enclosed within single quotation marks (‘ ‘), number literals need not. Describe in brief different types of SQL functions? SQL functions can take arguments but always return some value.
Number Functions are: ROUND, TRUNC and MOD Date Functions: operates on values of the Date data type.
(All date functions return a value of DATE data type except the MONTHS_BETWEEN Function, which returns a number. Dual table is owned by the user SYS and can be accessed by all users.
TO_CHAR Function formats: TO_CHAR (date, ‘format_model’). Format model must be enclosed in single quotation marks and is case sensitive.
For ex: Select TO_CHAR (hiredate, ‘MM/YY’) from employee.
Character functions: accept character input and return both character and number values.
Types of character function are: a) Case-Manipulation Functions: LOWER, UPPER, INITCAP b) Character-Manipulation Functions: CONCAT, SUBSTR, LENGTH, INSTR, LPAD/RPAD, TRIM, REPLACE Number Functions: accept Numeric input and return numeric values.
This rule may not apply if the table has a concatenated primary key, in which case more than one column is required to uniquely identify each row.