This clause is not allowed if the column is specified in the primary key, or in a unique constraint of the table (SQLSTATE 42831).

如果表的主键或惟一性约束中指定了这个列，那么不允许使用这个子句(SQLSTATE 42831)。

youdao

The type clause also delineates the incoming key and value, which in the case of reading a file are the byte count and the line of text, respectively.

类型子句也指定了传入键和值，这对于读取文件分别是字节数和文本行数。

youdao

Not specifying key values in the WHERE clause of an SQL statement.

在SQL语句的WHERE子句里没有指定键值

youdao

The Bill was published last month, and the key bit is Clause 8.

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This clause was seen as key to getting backing for the trade deal.

BBC: EU-South Korea trade deal backed by European Parliament

The key thing is that under its Commerce Clause powers, Congress can use the threat of fines and even jail time to compel behavior.

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