Explanation:
SELECT
distributor_id,
COUNT(*) AS TOTAL,
COUNT(IF(level='exec',1,null)),
COUNT(IF(level='personal',1,null))
FROM sometable;
Answer:
Al hablar de entornos digitales de enseñanza y aprendizaje, la frase apunta al avenimiento de medios informáticos y tecnológicos al proceso metodológico de enseñanza de los distintos sistemas educativos a nivel mundial.
Así, la irrupción del internet como medio de búsqueda de información y las herramientas digitales como vídeos, diapositivas y libros electrónicos como métodos de presentación de información han facilitado el acceso de los alumnos y docentes al conocimiento a través de la generación de un entorno digital que permite a estos un acceso mas rápido y abarcativo al conocimiento.
Answer:An initial condition is an extra bit of information about a differential equation that tells you the value of the function at a particular point. Differential equations with initial conditions are commonly called initial value problems.
The video above uses the example
{
d
y
d
x
=
cos
(
x
)
y
(
0
)
=
−
1
to illustrate a simple initial value problem. Solving the differential equation without the initial condition gives you
y
=
sin
(
x
)
+
C
.
Once you get the general solution, you can use the initial value to find a particular solution which satisfies the problem. In this case, plugging in
0
for
x
and
−
1
for
y
gives us
−
1
=
C
, meaning that the particular solution must be
y
=
sin
(
x
)
−
1
.
So the general way to solve initial value problems is: - First, find the general solution while ignoring the initial condition. - Then, use the initial condition to plug in values and find a particular solution.
Two additional things to keep in mind: First, the initial value doesn't necessarily have to just be
y
-values. Higher-order equations might have an initial value for both
y
and
y
′
, for example.
Second, an initial value problem doesn't always have a unique solution. It's possible for an initial value problem to have multiple solutions, or even no solution at all.
Explanation:
Answer:
Deleting a record on a B-tree consists of three main events:
- Searching the node where the key to be deleted exists
- Deleting the key
- Balancing the tree if required
Explanation:
q = NULL;
p = tree;
while (p) {
i = nodesearch(p, key);
q = p;
if (i < used(p) -1 && key == k(p,i)) {
found = TRUE;
position = i;
break;
}
p = son(p,i);
}
if (!found)
else if (subtree(p)) {
if (used(p) > ((n-1)/2)+1)
delkey (p, position, key);
else {
replace (p, position, fsucc(p));
p0 r1 p1 r2 p2 r3 ……. pn-1 rn-1 pn
q = &fsucc(p);
qpos = index of fsucc;
if (used(rbrother(p)) > ((n-1)/2)+1)
replace (q, qpos, sonsucc(q));
else
while (q && used(q) < (n-1)/2) {
concatenate(q, brother(q));
q = father(q);
}
}
}
else
delkey(p, position, key);
}
Any mobile device contains a(n) accelerometer and gyroscope that can sense even the smallest movements.
<h3>What are accelerometers? What does an accelerometer sensor do in mobile phones?</h3>
The orientation of a mobile phone is determined by the accelerometer in the device. The gyroscope, or gyro for short, tracks rotation or twist to provide another dimension to the data provided by the accelerometer.
A smartphone's built-in accelerometer measures the device's acceleration. It tracks the different motions like shaking, tilting, swinging, and rotating and accordingly changes the orientation of your app. The accelerometer utilizes the value of XYZ to determine and detect motion.
To know more about accelerometer , Visit:
<u>brainly.com/question/27960990</u>
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