"candidate key" meaning in English

{
  "forms": [
    {
      "form": "candidate keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "candidate key (plural candidate keys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Computing",
          "orig": "en:Computing",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Databases",
          "orig": "en:Databases",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "In the design of a database table, a column (or an irreducible group of them) able to identify every row of the table, having a unique value or set of values in each row. One of the candidate keys (abbreviated CKs) will be the primary key."
      ],
      "id": "en-candidate_key-en-noun-dcVf4eq5",
      "links": [
        [
          "computing",
          "computing#Noun"
        ],
        [
          "database",
          "database"
        ],
        [
          "table",
          "table"
        ],
        [
          "column",
          "column"
        ],
        [
          "row",
          "row"
        ],
        [
          "CK",
          "CK"
        ],
        [
          "primary key",
          "primary key"
        ]
      ],
      "raw_glosses": [
        "(computing, databases) In the design of a database table, a column (or an irreducible group of them) able to identify every row of the table, having a unique value or set of values in each row. One of the candidate keys (abbreviated CKs) will be the primary key."
      ],
      "related": [
        {
          "word": "business key"
        },
        {
          "word": "foreign key"
        },
        {
          "word": "natural key"
        },
        {
          "word": "primary key"
        },
        {
          "word": "first normal form"
        }
      ],
      "topics": [
        "computing",
        "databases",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "candidate key"
}

{
  "forms": [
    {
      "form": "candidate keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "candidate key (plural candidate keys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "business key"
    },
    {
      "word": "foreign key"
    },
    {
      "word": "natural key"
    },
    {
      "word": "primary key"
    },
    {
      "word": "first normal form"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Computing",
        "en:Databases"
      ],
      "glosses": [
        "In the design of a database table, a column (or an irreducible group of them) able to identify every row of the table, having a unique value or set of values in each row. One of the candidate keys (abbreviated CKs) will be the primary key."
      ],
      "links": [
        [
          "computing",
          "computing#Noun"
        ],
        [
          "database",
          "database"
        ],
        [
          "table",
          "table"
        ],
        [
          "column",
          "column"
        ],
        [
          "row",
          "row"
        ],
        [
          "CK",
          "CK"
        ],
        [
          "primary key",
          "primary key"
        ]
      ],
      "raw_glosses": [
        "(computing, databases) In the design of a database table, a column (or an irreducible group of them) able to identify every row of the table, having a unique value or set of values in each row. One of the candidate keys (abbreviated CKs) will be the primary key."
      ],
      "topics": [
        "computing",
        "databases",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "candidate key"
}