Shulou(Shulou.com)05/31 Report--

Today, I will talk to you about how to check the data types of table fields in Sequoiadb. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.

[detailed description of the problem]

How do I view the data type of a table field?

[solution]

1. You can use the "operator-> function Operation-> $type" function to view the data type of the field. For example, it is used as a selector to return the data type of the field "a" value:

Db.foo.bar.find ({}, {"a": {"$type": 2}})

$type reference: http://doc.sequoiadb.com/cn/SequoiaDB-cat_id-1477878020-edition_id-302

2. Note that since v2.8, $type has been changed to a function operation and is no longer used as a match.

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