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json_exists_path description It is used to judge whether the field specified by json_path exists in the JSON data. If it exists, it returns TRUE, and if it does not exist, it returns FALSE ...
The EXISTS condition is an operator whose right operand is a subquery. The result of an EXISTS condition is true if the subquery resolves to at least one row. The result of a NOT EXISTS condition is ...
Aprenda qué es el operador EXISTS, por qué es útil y cómo usarlo en consultas SQL para comprobar si hay datos en una subconsulta. Además, aprenda a usar el operador NOT EXISTS.
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