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protogrid:card [2018-02-07 10:26] – 31.17.252.102protogrid:card [2020-06-19 14:37] (current) – jus
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 =====Comparison with relational databases===== =====Comparison with relational databases=====
 While in relational databases, a single data entry is given by a row of a table, a card represents the data entry in Protogrid. If you have a table "books" in which each entry has an attribute "ID", "Name", "Author", each of these attributes corresponds to a field on a card in Protogrid. While in relational databases, a single data entry is given by a row of a table, a card represents the data entry in Protogrid. If you have a table "books" in which each entry has an attribute "ID", "Name", "Author", each of these attributes corresponds to a field on a card in Protogrid.
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 +=====Meta-information about a card=====
 +You can display the properties of a card such as a card's ID, its creator and creation date using the option "This Card -> Show Properties". Using the option "This Card -> Show Mutation History" you can see all changes made to that card, including information about deletion and restoration of a card. Furthermore, whenever you add an attachment to the card, this is also logged in the mutation history.
  

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