What is context and index?

What is context and index?

A context is a location – time, place, and possible world – where a sentence is said. It has countless features, determined by the character of the location. An index is an n-tuple of features of context, but not necessarily features that go together in any possible context.

What is context index Oracle?

The CONTEXT index type is well suited for indexing large coherent documents in formats such as Microsoft Word, HTML, or plain text. With a CONTEXT index, you can also customize your index in a variety of ways. The documents must be loaded in a text table.

How do I search for a word in Oracle SQL?

To enter an Oracle Text query, use the SQL SELECT statement. Depending on the type of index, you use either the CONTAINS or CATSEARCH operator in the WHERE clause. You can use these operators programatically wherever you can use the SELECT statement, such as in PL/SQL cursors.

How do you create an index?

Create the index

Click where you want to add the index. On the References tab, in the Index group, click Insert Index. In the Index dialog box, you can choose the format for text entries, page numbers, tabs, and leader characters. You can change the overall look of the index by choosing from the Formats dropdown menu.

What is index example?

The definition of an index is a guide, list or sign, or a number used to measure change. An example of an index is a list of employee names, addresses and phone numbers. An example of an index is a stock market index which is based on a standard set at a particular time. noun.

What is domain index in Oracle?

A domain index is an index designed for a specialized domain, such as spatial or image processing. Users can build a domain index of a given type after the designer creates the indextype.

Does like use index in Oracle?

“When you use LIKE to search an indexed column for a pattern, Oracle can use the index to improve performance of a query if the leading character in the pattern is not % or _ . In this case, Oracle can scan the index by this leading character.

How do I find a specific word in a string in Oracle?

The Oracle INSTR function is used to search string for substring and find the location of the substring in the string. If a substring that is equal to substring is found, then the function returns an integer indicating the position of the first character of this substring.

How can I see the source code of a SQL view?

Right-click the View, select Design. You will see the designer/table layout, Column chooser, the Select statement and a window for results at the bottom.

What is an index in Word?

An index lists the terms and topics that are discussed in a document, along with the pages that they appear on. To create an index, you mark the index entries by providing the name of the main entry and the cross-reference in your document, and then you build the index.

Can you create an index in Word?

You can create your index using the built-in tools for Microsoft Word. Index entries can be created for: Individual words, phrases, or symbols; • Topics that span a range of pages; and • Cross-references that point to related entries, such as Fauna, See Animals.

What is called index?

An index is an indicator or measure of something. In finance, it typically refers to a statistical measure of change in a securities market. In the case of financial markets, stock and bond market indexes consist of a hypothetical portfolio of securities representing a particular market or a segment of it.

What are the types of index?

Expression-based indexes efficiently evaluate queries with the indexed expression.

• Unique and non-unique indexes.
• Clustered and non-clustered indexes.
• Partitioned and nonpartitioned indexes.
• Bidirectional indexes.
• Expression-based indexes.

What is B tree index in Oracle?

The B-tree index is the default index type in Oracle. This index type is known as B-tree because the table row identifier (ROWID) and associated column values are stored within index blocks in a balanced tree- like structure.

Where Bfile data will be stored?

The Oracle BFILE data type is an Oracle LOB data type that contains a reference to binary data with a maximum size of 4 gigabytes. An Oracle BFILE differs from other Oracle LOB data types in that its data is stored in a physical file in the operating system instead of on the server.

What is the difference between like and Ilike?

LIKE and ILIKE allow pattern matching within character-based column data. Their syntax is identical, but LIKE is case-sensitive, while ILIKE is case-insensitive.

How do you create a functional index?

The following example shows how to create a function-based index:

1. An index that uses the UPPER function has been created on the ENAME column. The following example queries the EMP table using the function-based index:
2. The function-based index (EMP_IDX) can be used for this query.
3. TIP.

How do I check if a string contains a substring in PL SQL?

How do you find the index of a character in a string in Oracle?

The INSTR functions search string for substring . The function returns an integer indicating the position of the character in string that is the first character of this occurrence. INSTR calculates strings using characters as defined by the input character set.

How do I list all views in SQL Server?

4 Ways to List All Views in a SQL Server Database

1. Option 1 – The VIEWS Information Schema View. You can use the VIEWS information schema view to get a list of all user-defined views in a database.
2. Option 2 – The sys.views System Catalog View.
3. Option 3 – The sys.objects System Catalog View.

Can we CREATE VIEW without table?

can we create a view without base tables? No.

What are the examples of index?

Index

• Index (indices) in Maths is the power or exponent which is raised to a number or a variable.
• Example: 23 = 2 × 2 × 2 = 8.
• Rule 1: If a constant or variable has index as ‘0’, then the result will be equal to one, regardless of any base value.
• Example: 50 = 1, 120 = 1, y0= 1.

How do you write an index?

How to Write an Index

1. Read the book. The first step may seem obvious, but it’s important to do a thorough readthrough of any book before you start on the indexing process.
2. Use indexing software.
3. Mark up the book.
4. Address formatting questions.
5. Make index entries.
6. Order your index entries.
7. Edit your index.

What are the different types of index?

How many indexes we can create?

Each table can have up to 999 nonclustered indexes, regardless of how the indexes are created: either implicitly with PRIMARY KEY and UNIQUE constraints, or explicitly with CREATE INDEX . For indexed views, nonclustered indexes can be created only on a view that has a unique clustered index already defined.