How can data be retrieved from a database in English?

1 year ago
Jackson Davis
1 minute

In the ES database, data queries can be performed using query statements. Some commonly used query statements include:

  1. Match query: a search based on the values of the specified field.
GET index_name/_search
{
  "query": {
    "match": {
      "field_name": "value"
    }
  }
}
  1. Term search: match exact values of a specified field.
GET index_name/_search
{
  "query": {
    "term": {
      "field_name": "value"
    }
  }
}
  1. Range query: Conduct a search based on the specified field’s range.
GET index_name/_search
{
  "query": {
    "range": {
      "field_name": {
        "gte": "value1",
        "lte": "value2"
      }
    }
  }
}
  1. Bool query: conducting a multi-condition query through logical operators.
GET index_name/_search
{
  "query": {
    "bool": {
      "must": [
        { "match": { "field1": "value1" } },
        { "match": { "field2": "value2" } }
      ],
      "must_not": [
        { "match": { "field3": "value3" } }
      ],
      "should": [
        { "match": { "field4": "value4" } }
      ]
    }
  }
}
  1. Aggregation query: Perform aggregation queries, such as calculating averages, maximums, minimums, and other statistical information.
GET index_name/_search
{
  "aggs": {
    "agg_name": {
      "aggregation_type": {
        "field": "field_name"
      }
    }
  }
}

Here are some commonly used SQL database query statements. The specific query method can be adjusted according to actual needs.

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