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The number of NULLs in the column.
列中null值的个数。
youdao
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The value for the first key is 4 bytes long and it is entirely NULLs.
第一个键的值为4字节且其完全为 NULL。
youdao
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The value for the first key is 4 bytes long and it is entirely NULLs.
第一个键的值为4字节且其完全为 NULL。
youdao