Session3_TSQL_DML

8/7/2019 Session3_TSQL_DML

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T-SQL for Data

Manipulation

Vu Tuyet Trinhtrinhvt-fit@mail.hut.edu.vn

Hanoi University of Technology

Microsoft

Overview of Transact-SQL

Based on AINSI SQL 92 standard

Composing of three categories

Data Manipulation Language (DML) Data Definition Language (DDL)

Data Control Language (DCL)

Having some Microsoft specific extensions

Beyond relational data

.net framework integration

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Outline

Selecting Data from Existing Tables

Inserting Data

Updating Data Deleting Data

Fulltext Serach

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Select Data

The simple syntax to select the itemsfrom the exit table is:

select <the items >

from <name of table>

where <conditions>

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Select Data

You can change the name of the items in the table:

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Select Data

You can insert some items as following:

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Select

Example a function µcount¶ to count the columns of the

table:

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Select Data

You can use some functions or some operations in the

Select Statement:

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Select Data

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Select Data

Functions

String

Functions

The Time

functions

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- ASCII()

- CHAR()

- UPPER()

- LOWER()

- LEN()- LTRIM()

- RTRIM()

- LEFT()

- RIGHT()

- AVG()

- MIN()

- MAX()

- SUM()- COUNT()

- SQUARE()

- SQRT()

- ROUND()

- GETDATE()

DATEPART(YY,g

etdate())

-DATEDIFF(X,Y,Z)

DAY(),MONTH(),

YEAR()

Select Data

Maths String Time

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Select Data

Besides, there are some functions to convert the data

- CAST() - CONVERT()

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Select

Order by«.ect«

Join..on

Cross join

Group by

Oder by

Compute

Having

Except ,

Intersect

Option

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Select-With statement

Specifies a temporary named result set, known as a common

table expression (CTE).

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Select-Order by

- You can arrange the result follow the first letter by using the

order by statement:

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Select-multiple tables

You can select the items from more than a table as

following:

With ³outer join´:

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Select ± multiple tables

Inner join:

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- When you select from more than 1 table, you can use the

join«on statement or you can use the cross join statement.

With the cross join statement, you don¶t have to have torelative condition between the tables and the result is all the

Objects:

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- You can select from many tables, and create a new table to

store that result:

Now, you can refresh the sql folder, and you can see the newtable named newtbl as the following:

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Select-merge

A new feature in SQL2008 is merge statement. You can merge 2 or

more tables:

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Select-Group by

Specifies the groups into which output rows are to be placed. If aggregate

functions are included in the SELECT clause <select list>, GROUP BY

calculates a summary value for each group.

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Select-Having

Specifies a search condition for a group or an aggregate

HAVING is typically used in a GROUP BY clause. When

GROUP BY

is not used, HAVING behaves like aW

HEREclause.

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Select-intersect

INTERSECT returns any distinct values that are returned by both the query

on the left and right sides of the INTERSECT operand.

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Select-except

EXCEPT returns any distinct values from the left query that

are not also found on the right query.

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Select-Compute by

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Select-For clause

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Insert

The simple syntax for Insert statement is:INSERT INTO<table(x,y,«)>

VALUES(a,b,«)

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Insert

- You can insert some values into the table, and you have to

insert all the value not null, and the primary key:

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Insert

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Insert

- You can create a new table and insert the values into that table

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Insert

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Insert

- Inserting data into a unique identifier column by using

NEWID()

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Insert

- Inserting data into a table through a view

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Insert

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Delete

The simple syntax:

delete from<table>

- Delete with the condition where

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Delete

- Using DELETE on the current row of a cursor

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Delete

- Using DELETE based on a subquery and using the Transact-

SQL extension

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Delete

- Using DELETE with the TOP clause

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Delete

Using DELETE with the OUTPUT clause

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Update

The simple syntax for Update statement is:

UPDATE <table>

SET <items to update>

WHERE <conditions>

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Update

- Using UPDATE with the FROM Clause

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Update

- Before :

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Update

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Fulltext Search

Full-Text Search Architecture

Administering Full-Text Search

Querying SQL Server Using Full-Text Search

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Overview

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Overview

The architecture consists of the following processes:

SQL Server process (Sqlservr.exe)

Microsoft Full-Text Engine for SQL Server process (Msftesql.exe)

Microsoft Full-Text Engine Filter Daemon process (Msftefd.exe)

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Full-Text Search Terminology

Full-text index

Stores information about significant words and their location within a given column. This information is used toquickly compute full-text queries that search for rows with particular words or combinations of words.

Full-text catalog

A full-text catalog contains zero or more full-text indexes. Full-text catalogs must reside on a local hard driveassociated with the instance of SQL Server. Each catalog can serve the indexing needs of one or more tables

within a database. Full-text catalogs cannot be stored on removable drives, floppy disks, or network drives, exceptwhen you attached a read-only database that contains a full-text catalog.

Word breaker

For a given language, a word breaker tokenizes text based on the lexical rules of the language.

Is a word or a character string identified by the word breaker.

Stemmer

For a given language, a stemmer generates inflectional forms of a particular word based on the rules of that

language. Stemmers are language specific. Filter Given a specified file type, for example .doc, filters extract text from a file stored in a varbinary(max) or

image column.

Population or Crawl Is the process of creating and maintaining a full-text index.

Noise words Are frequently occurring words that do not help the search. For example , for the English localewords such as "a", "and", "is", and "the" are considered noise words. These words are ignored to prevent the full-text index from becoming bloated.

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The system stored procedures that are used to implement and query

full-text indexes.

sp_fulltext_catalog

sp_help_fulltext_catalogs_cursor sp_fulltext_column

sp_help_fulltext_columns

sp_fulltext_database

sp_help_fulltext_columns_cursor

sp_fulltext_service

sp_help_fulltext_tablessp_fulltext_table

sp_help_fulltext_tables_cursor

sp_help_fulltext_catalogs

DENY permission [ ,...n ] ON FULLTEXT CATALOG :: full-

t ex t_catal og _name TO d atabase _ princ ipal [ ,...n ] [ CASCADE ] [ AS

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Full-text administration can be separated into three main

tasks:

Creating/altering/dropping full-text catalogs

Creating/altering/dropping full-text indexes

Scheduling and maintaining index population.

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Full-text indexes Regular SQL Server indexesStored in the file system, but

administered through the database.

Stored under the control of the database

in which they are defined.

Only one full-text index allowed per

table.

Several regular indexes allowed per

table.

Addition of data to full-text indexes,

called population, can be requested

through either a schedule or a specific

request, or can occur automatically withthe addition of new data.

Updated automatically when the data

upon which they are based is inserted,

updated, or deleted.

Grouped within the same database into

one or more full-text catalogs.Not grouped.

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Guidelines in administering full-text indexes (2)

Always select the smallest unique index available for your full-text unique key. (A 4-

byte, integer-based index is optimal.) This reduces the resources required by

Microsoft Search service in the file system significantly. If the primary key is large

(over 100 bytes), consider choosing another unique index in the table (or creating

another unique index) as the full-text unique key. Otherwise, if the full-text unique key

size exceeds the maximum size allowed (900 bytes), full-text population will not beable to proceed.

If you are indexing a table that has millions of rows, assign the table to its own full-

text catalog.

Consider the amount of change occurring in the tables being full-text indexed, as wellas the number of table rows. If the total number of rows being changed, together with

the numbers of rows in the table present during the last full-text population,

represents millions of rows, assign the table to its own full-text catalog.

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Guidelines in administering full-text indexes (3)

After the word breaker-routine has a list of valid words for a row within a column, the

full-text engine calculates tokens to represent the words. A token is simply a

compressed form of the original word that saves space and ensures that full-textindexes can be created in as compact a form as possible.

The full text-text functionality then builds all tokens in a column into inverted, stacked,

compressed structure within a file that is used for search operations. This uniquestructure allows ranking and scoring algorithms to efficiently satisfy possible queries.

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Full-Text query keywords

FREETEXT

FREETEXTTABLE

CONTAINS

CONTAINSTABLE

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FREETEXT

FREETEXT ( { c olumn _name | (c olumn _l ist ) | * } , 'f reet ex t_st ring ' [ ,

LANGUAGE lang uage _t erm ] )

SELECT ProductDescriptionID, Description FROM Production.ProductDescription

WHERE [Description] LIKE N'%bike%';

SELECT ProductDescriptionID, Description FROM Production.ProductionDescription

WHERE FREETEXT(Description, N¶bike¶); --Must be UNICODE. Otherwise prevents a

query optimizer from parameter sniffing

SELECT ProductDescriptionID, Description FROM Production.ProductionDescription

WHERE CONTAINS(Description, N¶bike¶);

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FREETEXTTABLE

FREETEXTTABLE (tabl e , { c olumn _name | (c olumn _l ist ) | * } , 'f reet ex t_st ring '

[ ,LANGUAGE lang uage _t erm ] [ ,t op _n _by _r ank ] )

The FREETEXTTABLE version of the previous FREETEXT query would look

like this:

SELECT PD.ProductDescriptionID, PD.Description, KEYTBL.[KEY],

KEYTBL.RANK FROM Production.ProductDescription AS PD

INNER JOIN FREETEXTTABLE()Production.ProductDescription, Description,

N¶bike¶)

AS KEYTBL ON PD.ProductDescriptionID = KEYTBL.[KEY]

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CONTAINS

CONTAINS ( { c olumn _name | (c olumn _l ist ) | * } , '< contains_search_condition

>' [ , LANGUAGE lang uage _t erm ] ) < contains_search_condition > ::= { <

simple_term > | < prefix_term > | < generation_term > | < proximity_term > |

< weighted_term > } | { ( < contains_search_condition > ) [ { < AND > | < ANDNOT > | < OR > } ] < contains_search_condition > [ ...n ] } < simple_term >

::= wor d | " phr ase " < prefix term > ::= { "wor d * " | " phr ase *" } <

generation_term > ::= FORMSOF ( { INFLECTIONAL | THESAURUS } , <

simple_term > [ ,...n ] ) < proximity_term > ::= { < simple_term > | < prefix_term >

} { { NEAR | ~ }

WHERE CONTAINS(Description, N'bike');

WHERE CONTAINS(Description, N'''bike*'''):

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WHERE CONTAINS(Description, N' FORMSOF (INFLECTIONAL, bike) ');

WHERE CONTAINS(Description, N' FORMSOF (THESAURUS, bike) ');

Word proximity is a common way of searching documents for multiple keywords or phrases. This typeof query uses the NEAR(~) keyword. The closer words are to each other , the better the match for

these types of queries. The proximity is used as a part of RANK calculation for rows matching the

search criteria. This keyword is rarely used with the CONTAINS predicate because the rank of

matched results cannot be evaluated directly.

WHERE CONTAINS(Description, N'mountain NEAR bike');

WHERE CONTAINS(Description, N'mountain ~ bike');

WHERE CONTAINS(Description, 'ISABOUT (mountain weight(.8), bike weight (.2) )');

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The CONTAINSTABLE function has the same capabilities as the CONTAINS function.

However , like the FREETEXTABLE function, it returns a rowset that contains a RANK

and a KEY column that can be used to return the best matches to a search.

CONTAINSTABLE ( tabl e , { c olumn _name | (c olumn _l ist ) | * } , ' <contains_search_condition > ' [ , LANGUAGE lang uage _t erm] [ ,t op _n _by _r ank ] ) <

contains_search_condition > ::= { < simple_term > | < prefix_term > | <

generation_term > | < proximity_term > | < weighted_term > } | { ( <

contains_search_condition > ) { { AND | & } | { AND NOT | &! } | { OR | | } } <

contains_search_condition > [ ...n ] } < simple_term > ::= wor d | " phr ase " <

prefix term > ::= { "wor d * " | " phr ase *" } < generation_term > ::= FORMSOF (

{ INFLECTIONAL | THESAURUS } , < simple_term > [ ,...n ] ) < proximity_term >::= { < simple_term > | < prefix_term > } { { NEAR | ~ } { < simple_term > | <

prefix_term > } } [ ...n ] < weighted_term > ::= ISABOUT ( { { < simple_term

> | < prefix_term > | < generation_term > | < proximity_term > } [ WEIGHT (

weight_value ) ] } [ ,...n ] )

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Full-text search much more powerful than LIKE

Used correctly, will produce more specific, relevant results

Better performance ± LIKE queries are designed for small amounts of

text data, full-text search scales to huge documents

Provides ranking of results

Common uses

Search through the content in a text-intensive, database driven website,

e.g. a knowledge base

Search the contents of documents stored in BLOB fields

Perform advanced searches

e.g. with exact phrases - "to be or not to be" (however needs care!)

e.g. Boolean operators - AND, OR, NOT, NEAR

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Writing FTS terms

The power of FTS is in the expression which is passed

to the CONTAINS or CONTAINSTABLE function

Several different types of terms:

Simple terms

Prefix terms

Generation terms

Proximity terms

Weighted terms

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Simple terms

Either words or phrases

Quotes are optional, but recommended

Matches columns which contain the exact words or phrases

specified Case insensitive

Punctuation is ignored

CONTAINS(Column, 'SQL')

CONTAINS(Column, ' "SQL" ')

CONTAINS(Column, 'Microsoft SQL Server')

CONTAINS(Column, ' "Microsoft SQL Server" ')

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Prefix terms

Matches words beginning with the specified text

CONTAINS(Column, ' "local*" ')

matches local, locally, locality

CONTAINS(Column, ' "local wine*" ')

matches "local winery", "locally wined"

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Generation terms

Two types:

Inflectional

FORMSOF(INFLECTIONAL, "expression")

Thesaurus

FORMSOF(THESAURUS, "expression")

Both return variants of the specified word, but variants

are determined differently

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Inflectional

Matches plurals and words which share the

same stem

When vague words such as "best" are used, doesn't match the exact word, only "good"

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Thesaurus

Supposed to match synonyms of search terms ± but the

thesaurus seems to be very limited

Does not match plurals

Not particularly useful

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Proximity terms

SyntaxCONTAINS(Column, 'local NEAR winery')

CONTAINS(Column, ' "local" NEAR "winery" ')

Matches words which are NEAR each other Terms on either side of NEAR must be either simple or

proximity terms

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Weighted terms

Each word can be given a rank

Can be combined with simple, prefix, generation and

proximity terms

e.g. CONTAINS(Column, 'ISABOUT(

performance weight(.8),

comfortable weight(.4)

CONTAINS(Column, 'ISABOUT(

FORMSOF(INFLECTIONAL, "performance") weight (.8),

FORMSOF(INFLECTIONAL, "comfortable") weight (.4)

Session3_TSQL_DML

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