sql server判断是否为null

sql server

  替换null:isnull(arg,value)

  如:select isnull(price,0.0) from orders ,如果price为null的话,用0.0替换

  与null比较: is not null,is null

  如 select * from orders where price is null ,price等于null

  如: select * from orders where price is not null ,price不等于null

  Oracle

  替换null: nvl(arg,value)

  如: select nvl(price,0.0) form orders

  与null比较: is not null,is null

  如 select * from orders where price is null ,price等于null

  如: select * from orders where price is not null ,price不等于null

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