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Basic SQL types String Char(n): fixed length. Padded - PowerPoint PPT Presentation

May 23, 2023 •688 likes •733 views

Basic SQL types String Char(n): fixed length. Padded Varchar(n): variable length Number Integer: 32 bit Decimal(5,2): 999.99 Real, Double: 32 bit, 64 bit Datetime Date: 2002-01-15 Time:

  1. Basic SQL types • String – Char(n): fixed length. Padded – Varchar(n): variable length • Number – Integer: 32 bit – Decimal(5,2): 999.99 – Real, Double: 32 bit, 64 bit • Datetime – Date: ‘2002-01-15’ – Time: ’13:40:00’ – Timestamp: ‘2002-01-15 13:40:00’

  2. Schema definition (table creation) Course(dept,cnum,sec,unit,instructor,title) CREATE TABLE Course ( dept CHAR(2) NOT NULL, cnum INTEGER NOT NULL, sec INTEGER NOT NULL, unit INTEGER, instructor VARCHAR(30), title VARCHAR(30), PRIMARY KEY(dept, cnum, sec) )

  3. Schema definition (table creation) Course(dept,cnum,sec,unit,instructor,title) Course(dept,cnum,sec,unit,instructor,title) Course(dept,cnum,sec,unit,instructor,title) CREATE TABLE Course ( dept CHAR(2) NOT NULL DEFAULT ‘CS’, cnum INTEGER NOT NULL, sec INTEGER NOT NULL, unit INTEGER, instructor VARCHAR(30), title VARCHAR(30) DEFAULT, PRIMARY KEY(dept, cnum, sec) UNIQUE(dept, cnum, instructor), UNIQUE(dept, sec, title) )

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