Chapter 6: SQL (Structured Query Language)

Chương 3 Structured Query Language Phần 2

... nvarchar (30 ) NULL, DIACHI nvarchar(40) NULL, THANHPHO nvarchar(50) NOT NULL, DIENTHOAI nvarchar(50) NULL ) Tạo cấu trúc bảng CREATE TABLE NHANVIEN ( MANV int NOT NULL, HONV nvarchar (20 ) NULL, ... NOT NULL, DIENTHOAI nvarchar( 13) NULL, CONSTRAINT PK_NHANVIEN PRIMARY KEY (MANV) ) Tạo cấu trúc bảng CREATE TABLE SANPHAM ( MASP tinyint NOT NULL, TENSP nvarchar (20 ) NULL, DVT nvarchar(10) NULL, ... Nội dung  DDL (Data Definition Language)      Định nghĩa Database Định nghĩa cấu trúc Bảng Định nghĩa ràng buộc toàn vẹn Định...

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Structured Query Language

... ascending order Range Queries Using BETWEEN Subquery    Subquery is query within a query A SELECT statement can be nested inside another query to form a subquery A subselect can be used in WHERE and ... Introduction        SQL stands for Structured Query Language. ” SQL is a language used to interact with the database SQL is a data access language SQL is based on relational tuple calculus ... SELECT, where it is called a subquery or nested query Subselects may also appear in INSERT, UPDATE, and DELETE statements Subquery  Scalar subquery   A scalar subquery returns single row, single...

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Structured query language

...  77     Tutorial: Structured Query Language  (SQL)       Introduction  to  SQL   SQL   (Structured Query Language)  is  a  database  computer language  designed  for  managing ... Tutorial: Structured Query Language  (SQL)   15     CREATE  TABLE     Below  we  see  the  same  tables  inside  the  design  tool  in  SQL  Server       Tutorial: Structured Query Language ... CustomerNumber int Tutorial: Structured Query Language  (SQL)   29     Else ALTER TABLE CUSTOMER ADD CustomerNumber int GO   Tutorial: Structured Query Language  (SQL)   CREATE  TABLE...

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SQL the query language

... that the answer does not change – Internal cost model drives use of indexes and choice of access paths and physical operators The SQL Query Language • The most widely used relational query language ... involved than HW Relational Query Languages • A major strength of the relational model: supports simple, powerful querying of data • Two sublanguages: • DDL – Data Defn Language – define and modify ... indicating that the answer should not contain duplicates – In SQL SELECT, the default is that duplicates are not eliminated! (Result is called a “multiset”) Query Semantics • Semantics of an SQL query...

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Bài 4 Structured Query Language Phần 1

... 15 :58:33. 247 NULL 22 2 011 -11 -18 15 :58:33. 247 NULL 23 2 011 -11 -18 15 :58:33. 247 NULL 24 2 011 -11 -18 15 :58:33. 247 NULL 25 2 011 -11 -18 15 :58:33. 247 NULL 26 2 011 -11 -18 15 :58:33. 247 NULL 27 2 011 -11 -18 15 :58:33. 247 ... 'EmotionImages' 1> 2> 3> select I_ID, I_CreatedDate, Emo from Images where I_ID >= 20 4> go I_ID I_CreatedDate Emo - - -20 2 011 -11 -18 15 :58:33. 247 NULL 21 2 011 -11 -18 15 :58:33. 247 ... 2 011 -11 -18 15 :58:33. 247 NULL 27 2 011 -11 -18 15 :58:33. 247 NULL 28 2 011 -11 -18 15 :58:33. 247 NULL (9 rows affected) 1> _ EE4509, EE4253, EE 613 3 – HK1 2 013 /20 14 TS Đào Trung Kiên – ĐH Bách khoa Hà Nội Các...

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