What does REF mean in SQL?

What is ref in SQL?

To use a reference type in an SQL statement, use REF(t ype-name ), where type-name represents the referenced type. … Db2 uses the reference type as the type of the object identifier column in typed tables. The object identifier uniquely identifies a row object in the typed table hierarchy.

What is reference Equal used for in SQL?

= (Equals) (Transact-SQL)

What is ref type in PL SQL?

A ref is a pointer to a record in a SQL (i.e. database) object table. Consequently Oracle supports them in SQL but not in PL/SQL.

Is ref a data type in Oracle?

REF Datatype. A REF is a logical “pointer” to a row object. It is an Oracle built-in datatype.

What does REF mean in a table?

An #REF error (the “ref” stands for reference) is the message Excel displays when a formula references a cell that no longer exists, usually caused by deleting cells that a formula is referring to.

What is about ref in Oracle Ordb?

REF takes as its argument a correlation variable (table alias) associated with a row of an object table or an object view. A REF value is returned for the object instance that is bound to the variable or row.

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What does * do in mysql?

Table 12.3 Operators

Name Description
* Multiplication operator
+ Addition operator
Minus operator
Change the sign of the argument

How do I check if a string equals in SQL?

In SQL, we can compare two strings using STRCMP () function. STRCMP () returns ‘0’ when the two strings are the same, returns ‘-1’ if the first string is smaller than the second string, and returns 1 if the first string is larger than the second string.

How do you handle exceptions in PL SQL?

PL/SQL allows you to define your own exceptions according to the need of your program. A user-defined exception must be declared and then raised explicitly, using either a RAISE statement or the procedure DBMS_STANDARD. RAISE_APPLICATION_ERROR.

What is difference between cursor and ref cursor?

A cursor is really any SQL statement that runs DML (select, insert, update, delete) on your database. A ref cursor is a pointer to a result set. This is normally used to open a query on the database server, then leave it up to the client to fetch the result it needs.

What is raw data type?

In Oracle PL/SQL, RAW is a data type used to store binary data, or data which is byte oriented (for example, graphics or audio files). One of the most important things to note about RAW data is that it can only be queried or inserted; RAW data cannot be manipulated.

What is the data type in Oracle?

Oracle Built-In Datatypes. A datatype associates a fixed set of properties with the values that can be used in a column of a table or in an argument of a procedure or function.

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What is Number data type in Oracle?

The Oracle NUMBER data type is used to store numeric values that can be negative or positive. The following illustrates the syntax of the NUMBER data type: NUMBER[(precision [, scale])] The Oracle NUMBER data type has precision and scale. The precision is the number of digits in a number.

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