como hacer una consulta de un registro que no esta en una tabla en mysql
SELECT t1.*
FROM data_base_ct t1
LEFT JOIN data_inicio_primera_etapa t2
ON t2.codigo_ct = t1.codct
WHERE t2.codigo_ct IS NULL
como hacer una consulta de un registro que no esta en una tabla en mysql
SELECT t1.*
FROM data_base_ct t1
LEFT JOIN data_inicio_primera_etapa t2
ON t2.codigo_ct = t1.codct
WHERE t2.codigo_ct IS NULL
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