一个外键约束精确地引用一张目标表（target table）；定义一个引用多表的外键不容易。必须编写一个程序化的约束来加强这种完整性规则。
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inner table target 内表指标
target table
目标表
以上为机器翻译结果，长、整句建议使用 人工翻译 。
youdao
Add an index to the target table.
向目标表中添加一个索引就可以了。
The target table must have a primary key.
目标表必须有一个主键。
Unfortunately for me, rather than an A-list patsy, the bounty target at my table was Jordan Mayers, a wealth manager who came in sixth last year and also finished in the money at the World Series of Poker.
FORBES: Inside Warren Buffett's Private Poker Game
One option on the table is to target "nominal GDP" instead.
BBC: Budget 2013: Radical options for the UK economy
Upgrades or price-target increases could bring additional buyers to the table.
FORBES: Zynga Call Options in High Demand Ahead of Earnings
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