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Basic SQL types

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’. Schema definition (table creation).

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Basic SQL types

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  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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