1.ֱӴͼӴ
    ֱӴ CREATE INDEX mycolumn_index ON mytable (myclumn)
    ӴԼΨһԼԼԼӴ
    2.ͨΨһ
    ͨCREATE INDEX mycolumn_index ON mytable (myclumn)
    Ψһ֤еȫΨһģԾ۴ͷǾ۴ʹ
    CREATE UNIQUE COUSTERED INDEX myclumn_cindex ON mytable(mycolumn)
    3.͸
    Ǹ
    ֽͬʱֶ16ֶ
    CREATE INDEX name_index ON username(firstname,lastname)
    4.۴ͷǾ۴(ۼȺ)
   ۴˳ֵͬ˳ǰ˳
    CREATE CLUSTERED INDEX mycolumn_cindex ON mytable(mycolumn) WITH
    ALLOW_DUP_ROW(ظ¼ľ۴)
   Ǿ۴CREATE UNCLUSTERED INDEX mycolumn_cindex ON mytable(mycolumn)
