Contenido del Curso
TEST SQL COURSE E2E
TEST SQL COURSE E2E
Retrieving Distinct Rows
Note that the SELECT statement returns all rows in a given column. Nevertheless, what if we don't need all the values from a column (because they can be duplicated), and we only need unique values? For such cases, it is convenient to use the keyword DISTINCT. Moreover, this keyword is used immediately before the column names. Let's look at an example.
SELECT DISTINCT region FROM country;
Tarea
You have to retrieve distinct (unique) continent values.
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¡Gracias por tus comentarios!
Retrieving Distinct Rows
Note that the SELECT statement returns all rows in a given column. Nevertheless, what if we don't need all the values from a column (because they can be duplicated), and we only need unique values? For such cases, it is convenient to use the keyword DISTINCT. Moreover, this keyword is used immediately before the column names. Let's look at an example.
SELECT DISTINCT region FROM country;
Tarea
You have to retrieve distinct (unique) continent values.
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¡Gracias por tus comentarios!
Retrieving Distinct Rows
Note that the SELECT statement returns all rows in a given column. Nevertheless, what if we don't need all the values from a column (because they can be duplicated), and we only need unique values? For such cases, it is convenient to use the keyword DISTINCT. Moreover, this keyword is used immediately before the column names. Let's look at an example.
SELECT DISTINCT region FROM country;
Tarea
You have to retrieve distinct (unique) continent values.
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¡Gracias por tus comentarios!
Note that the SELECT statement returns all rows in a given column. Nevertheless, what if we don't need all the values from a column (because they can be duplicated), and we only need unique values? For such cases, it is convenient to use the keyword DISTINCT. Moreover, this keyword is used immediately before the column names. Let's look at an example.
SELECT DISTINCT region FROM country;
Tarea
You have to retrieve distinct (unique) continent values.
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opcionesCambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones