primary key [ˈpraɪˌmɛri ki]

例句:

• You must specify the primary key for a table.
  您必须指定主键的表.
  
• A primary key is a column a unique value for each row.
  主键是指每记录行带有唯一值的栏目.
  
• The primary key can be specified only for the top root view.
  不可以在一列或多列上同时有主键和唯一约束.
  
• Through a state-run tourism company, Gaviota, it also plays a primary role in the - now key - sector of tourism.
  来自BBC
• Last Thursday the team reported that a key circuit on the boiler - controlling the primary burner - had failed to start.
  来自BBC
• But they know that the ballads which also match Hegarty's primary soundscape are the key to their connection with Wyatt.
  来自BBC