CASE expression in WHERE clause for diferent and - sql

Can I use case expression to build where like this?
select *
from table
where
case
when x=y then z= j and t=v
when x=k then q= p and s=l
end
;
I need change where clause depending on the value of x variable.


Use or:
select *
from table
where (x = y and z = j and t = v) or (x = k and q = p and s = l);


An alternative to using OR is to use nested CASE statements:
SELECT *
FROM table_name
WHERE CASE
WHEN x = y THEN CASE WHEN z = j AND t = v THEN 1 ELSE 0 END
WHEN x = k THEN CASE WHEN q = p AND s = l THEN 1 ELSE 0 END
ELSE 0
END = 1;
or you could simplify it to:
SELECT *
FROM table_name
WHERE CASE
WHEN x = y AND z = j AND t = v THEN 1
WHEN x = k AND q = p AND s = l THEN 1
ELSE 0
END = 1;
However, you should check whether Oracle can use column indexes or if a separate function-based index is required with these solutions.

Related

How to select twice the same column on join query?

How Can I to count the gender when is M or F, somehting like
SELECT count(N.gender)
FROM `DATABASE_T` as T
LEFT JOIN `DATABASE_N` as N
ON
T.ENCUESTA = N.ENCUESTA AND
T.P_DEPTO = N.P_DEPTO AND
T.P_MUNIC = N.P_MUNIC AND
T.COD_VEREDA = N.COD_VEREDA AND
T.PAIS = N.PAIS and
T.UC_UO = N.UC_UO
WHERE N.ID_PROD=1 and N.gender="M"

SELECT countif(N.gender = 'M') as M, countif(N.gender = 'F') as F
FROM `DATABASE_T` as T
LEFT JOIN `DATABASE_N` as N
ON
T.ENCUESTA = N.ENCUESTA AND
T.P_DEPTO = N.P_DEPTO AND
T.P_MUNIC = N.P_MUNIC AND
T.COD_VEREDA = N.COD_VEREDA AND
T.PAIS = N.PAIS and
T.UC_UO = N.UC_UO
WHERE N.ID_PROD=1

Since you did not describe the structure of your table and use Spanish-looking identifiers, I will use a clearer example with my own schema:
SELECT
SUM( CASE WHEN Sex = 'M' THEN 1 ELSE 0 END ) AS M,
SUM( CASE WHEN Sex = 'F' THEN 1 ELSE 0 END ) AS F
FROM People
WHERE People.Dept = 5

How to Update with subquery in PostgreSQL

I have a function in MS SQL Server just like this:
UPDATE r
SET
monthly =
(
SELECT SUM(-h.value_ini - h.purchase + h.sold + h.value_fin)
FROM hist_portfolio AS h
WHERE h.comp_id = r.comp_id
AND h.port_id = r.port_id
AND h.exte_id = r.cate_id
AND h.type_id = #type_rel_aux
AND h.hcar_day > #date_month_before
AND h.hcar_day <= #date_base
)
FROM #Month_Table r
WHERE type = 1;
and thats the result (after update):
Seq monthly
2 102471,34
1 -5129,46
3 -29841,23
4 0
But when I execute the same update in a fuction in PostgreSQL, all the rows get the same value:
UPDATE Month_Table
SET variacao_mes_rs = (
SELECT SUM(-h.value_ini - h.purchase + h.sold + h.value_fin)
FROM hist_portfolio AS h
WHERE h.comp_id = r.comp_id
AND h.port_id = r.port_id
AND h.exte_id = r.cate_id
AND h.type_id = v_type_rel_aux
AND h.hcar_day > v_date_month_before
AND h.hcar_day <= v_date_base) FROM Month_Table r WHERE type = 1;
Result (after update), all the same value of Seq 3:]
Seq monthly
1 -29841,23
2 -29841,23
3 -29841,23
4 -29841,23
I don't see the cause of the problem...
Does PostgreSQL have different rules on UPDATE?
Can anyone help me?

Remove the FROM clause from Postgres:
UPDATE Month_Table r
SET variacao_mes_rs = (
SELECT SUM(-h.value_ini - h.purchase + h.sold + h.value_fin)
FROM hist_portfolio AS h
WHERE h.comp_id = r.comp_id
AND h.port_id = r.port_id
AND h.exte_id = r.cate_id
AND h.type_id = v_type_rel_aux
AND h.hcar_day > v_date_month_before
AND h.hcar_day <= v_date_base)
WHERE type = 1;
The FROM clause in an UPDATE behaves differently in the two databases, as you have discovered.

Trying to do a gaussian bell in Scilab

I'm trying to do a Gaussian bell using the data I am obtaining from a matrix but everytime I try to run the program I obtain this message:
"Error: syntax error, unexpected identifier, expecting end"
The data used to obtain the gaussina bell is a matrix which includes the last point of every n displacements, which are the last position of a particle. I want to know if there is an easier way to obtain the gaussian bell in scilab because I have to also do a fit with an histogram using the same data.
function bla7()
t=4000
n=1000
l=0.067
p=%pi*2
w1=zeros(t,1);
w2=zeros(t,1);
for I=1:t
a=(grand(n,1,"unf",0,p));
x=l*cos(a)
y=l*sin(a)
z1=zeros(n,1);
z2=zeros(n,1);
for i=2:n
z1(i)=z1(i-1)+x(i);
z2(i)=z2(i-1)+y(i);
end
w1(I)=z1($)
w2(I)=z2($)
end
n=10000
w10=zeros(t,1);
w20=zeros(t,1);
for I=1:t
a=(grand(n,1,"unf",0,p));
x=l*cos(a)
y=l*sin(a)
z1=zeros(n,1);
z2=zeros(n,1);
for i=2:n
z1(i)=z1(i-1)+x(i);
z2(i)=z2(i-1)+y(i);
end
w10(I)=z1($)
w20(I)=z2($)
end
n=100
w100=zeros(t,1);
w200=zeros(t,1);
for I=1:t
a=(grand(n,1,"unf",0,p));
x=l*cos(a)
y=l*sin(a)
z1=zeros(n,1);
z2=zeros(n,1);
for i=2:n
z1(i)=z1(i-1)+x(i);
z2(i)=z2(i-1)+y(i);
end
w100(I)=z1($)
w200(I)=z2($)
end
k=70
v=12/k
c1=zeros(k,1)
for r=1:t
c=w1(r)
m=-6+v
n=-6
for g=1:k
if (c<m & c>=n) then
c1(g)=c1(g)+1
m=m+v
n=n+v
else
m=m+v
n=n+v
end
end
end
c2=zeros(k,1)
c2(1)=-6+(6/k)
for b=2:k
c2(b)=c2(b-1)+v
end
y = stdev(w1)
normal1=zeros(k,1)
normal2=zeros(k,1)
bb=-6
bc=-6+v
for wa=1:k
bd=(bb+bc)/2
gauss1=(1/(y*sqrt(2*%pi)))exp(-0.5(bb/y)^2)
gauss2=(1/(y*sqrt(2*%pi)))exp(-0.5(bc/y)^2)
gauss3=(1/(y*sqrt(2*%pi)))exp(-0.5(bd/y)^2)
gauss4=((bc-bb)/6)*(gauss1+gauss2+4*gauss3)
bb=bb+v
bc=bc+v
normal2(wa,1)=gauss4
end
normal3=normal2*4000
k=100
v=24/k
c10=zeros(k,1)
for r=1:t
c=w10(r)
m=-12+v
n=-12
for g=1:k
if (c<m & c>=n) then
c10(g)=c10(g)+1
m=m+v
n=n+v
else
m=m+v
n=n+v
end
end
end
c20=zeros(k,1)
c20(1)=-12+(12/k)
for b=2:k
c20(b)=c20(b-1)+v
end
y = stdev(w10)
normal10=zeros(k,1)
normal20=zeros(k,1)
bb=-12
bc=-12+v
for wa=1:k
bd=(bb+bc)/2
gauss10=(1/(y*sqrt(2*%pi)))exp(-0.5(bb/y)^2)
gauss20=(1/(y*sqrt(2*%pi)))exp(-0.5(bc/y)^2)
gauss30=(1/(y*sqrt(2*%pi)))exp(-0.5(bd/y)^2)
gauss40=((bc-bb)/6)*(gauss10+gauss20+4*gauss30)
bb=bb+v
bc=bc+v
normal20(wa,1)=gauss40
end
normal30=normal20*4000
k=70
v=12/k
c100=zeros(k,1)
for r=1:t
c=w100(r)
m=-6+v
n=-6
for g=1:k
if (c<m & c>=n) then
c100(g)=c100(g)+1
m=m+v
n=n+v
else
m=m+v
n=n+v
end
end
end
c200=zeros(k,1)
c200(1)=-6+(6/k)
for b=2:k
c200(b)=c200(b-1)+v
end
y = stdev(w100)
normal100=zeros(k,1)
normal200=zeros(k,1)
bb=-6
bc=-6+v
for wa=1:k
bd=(bb+bc)/2
gauss100=(1/(y*sqrt(2*%pi)))exp(-0.5(bb/y)^2)
gauss200=(1/(y*sqrt(2*%pi)))exp(-0.5(bc/y)^2)
gauss300=(1/(y*sqrt(2*%pi)))exp(-0.5(bd/y)^2)
gauss400=((bc-bb)/6)*(gauss100+gauss200+4*gauss300)
bb=bb+v
bc=bc+v
normal200(wa,1)=gauss400
end
normal300=normal200*4000
bar(c20,c10,1.0,'white')
plot(c20, normal30, 'b-')
bar(c2,c1,1.0,'white')
plot(c2, normal3, 'r-')
bar(c200,c100,1.0,'white')
plot(c200, normal300, 'm-')
poly1.thickness=3;
xlabel(["x / um"]);
ylabel("molecules");
gcf().axes_size=[500,500]
a=gca();
a.zoom_box=[-12,12;0,600];
a.font_size=4;
a.labels_font_size=5;
a.x_label.font_size = 5;
a.y_label.font_size = 5;
ticks = a.x_ticks
ticks.labels =["-12";"-10";"-8";"-6";"-4";"-2";"0";"2";"4";"6";"8";"10";"12"]
ticks.locations = [-12;-10;-8;-6;-4;-2;0;2;4;6;8;10;12]
a.x_ticks = ticks
endfunction

Each and every one of your gauss variables are missing the multiplication operator in two places. Check every line at it will run. For example, this:
gauss1=(1/(y*sqrt(2*%pi)))exp(-0.5(bb/y)^2)
should be this:
gauss1=(1/(y*sqrt(2*%pi))) * exp(-0.5 * (bb/y)^2)
As for the Gaussian bell, there is no standard function in Scilab. However, you could define a new function to make things more clear in your case:
function x = myGauss(s,b_)
x = (1/(s*sqrt(2*%pi)))*exp(-0.5*(b_/s)^2)
endfunction
Actually, while we're at it, your whole code is really difficult to read. You should define functions instead of repeating code: it helps clarify what you mean, and if there is a mistake, you need to fix only one place. Also, I personally do not recommend that you enclose everything in a function like bla7() because it makes things harder to debug. Your example could be rewritten like this:
The myGauss function;
A function w_ to calculate w1, w2, w10, w20, w100 and w200;
A function c_ to calculate c1, c2, c10, c20, c100 and c200;
A function normal_ to calculate normal1, normal2, normal10, normal20, normal100 and normal200;
Call all four functions as many times as needed with different inputs for different results.
If you do that, your could will look like this:
function x = myGauss(s,b_)
x = (1 / (s * sqrt(2 * %pi))) * exp(-0.5 * (b_/s)^2);
endfunction
function [w1_,w2_] = w_(t_,l_,n_,p_)
w1_ = zeros(t_,1);
w2_ = zeros(t_,1);
for I = 1 : t_
a = (grand(n_,1,"unf",0,p_));
x = l_ * cos(a);
y = l_ * sin(a);
z1 = zeros(n_,1);
z2 = zeros(n_,1);
for i = 2 : n_
z1(i) = z1(i-1) + x(i);
z2(i) = z2(i-1) + y(i);
end
w1_(I) = z1($);
w2_(I) = z2($);
end
endfunction
function [c1_,c2_] = c_(t_,k_,v_,w1_,x_)
c1_ = zeros(k_,1)
for r = 1 : t_
c = w1_(r);
m = -x_ + v_;
n = -x_;
for g = 1 : k_
if (c < m & c >= n) then
c1_(g) = c1_(g) + 1;
m = m + v_;
n = n + v_;
else
m = m + v_;
n = n + v_;
end
end
end
c2_ = zeros(k_,1);
c2_(1) = -x_ + (x_/k_);
for b = 2 : k_
c2_(b) = c2_(b-1) + v_;
end
endfunction
function [normal1_,normal2_,normal3_] = normal_(k_,bb_,bc_,v_,w1_)
y = stdev(w1_);
normal1_ = zeros(k_,1);
normal2_ = zeros(k_,1);
for wa = 1 : k_
bd_ = (bb_ + bc_) / 2;
gauss1 = myGauss(y,bb_);
gauss2 = myGauss(y,bc_);
gauss3 = myGauss(y,bd_);
gauss4 = ((bc_ - bb_) / 6) * (gauss1 + gauss2 + 4 * gauss3);
bb_ = bb_ + v_;
bc_ = bc_ + v_;
normal2_(wa,1) = gauss4;
end
normal3_ = normal2_ * 4000;
endfunction
t = 4000;
l = 0.067;
p = 2 * %pi;
n = 1000;
k = 70;
v = 12 / k;
x = 6;
bb = -x;
bc = -x + v;
[w1,w2] = w_(t,l,n,p);
[c1,c2] = c_(t,k,v,w1,x);
[normal1,normal2,normal3] = normal_(k,bb,bc,v,w1);
bar(c2,c1,1.0,'white');
plot(c2, normal3, 'r-');
n = 10000;
k = 100;
v = 24 / k;
x = 12;
bb = -x;
bc = -x + v;
[w10,w20] = w_(t,l,n,p);
[c10,c20] = c_(t,k,v,w10,x);
[normal10,normal20,normal30] = normal_(k,bb,bc,v,w10);
bar(c20,c10,1.0,'white');
plot(c20, normal30, 'b-');
n = 100;
k = 70;
v = 12 / k;
x = 6;
bb = -x;
bc = -x + v;
[w100,w200] = w_(t,l,n,p);
[c100,c200] = c_(t,k,v,w100,x);
[normal100,normal200,normal300] = normal_(k,bb,bc,v,w100);
bar(c200,c100,1.0,'white');
plot(c200, normal300, 'm-');
poly1.thickness=3;
xlabel(["x / um"]);
ylabel("molecules");
gcf().axes_size=[500,500]
a=gca();
a.zoom_box=[-12,12;0,600];
a.font_size=4;
a.labels_font_size=5;
a.x_label.font_size = 5;
a.y_label.font_size = 5;
ticks = a.x_ticks
ticks.labels =["-12";"-10";"-8";"-6";"-4";"-2";"0";"2";"4";"6";"8";"10";"12"]
ticks.locations = [-12;-10;-8;-6;-4;-2;0;2;4;6;8;10;12]
a.x_ticks = ticks

Where Clause Case Statement; ORA-00907: missing parenthesis

I have a query and when I run it I get the error message ORA-00907: missing parenthesis. When I replace the CASE statement with either x = g and or y = g and it runs as expected.
SELECT *
FROM
table1,
table2,
table3,
table4,
table5,
table6,
table7,
table8
WHERE
a = b and
c = d and
e = d and
CASE strfldvar
WHEN 'BROKEN_ARROW' THEN (x = g)
WHEN 'BROKEN_BOX' THEN (y = g)
ELSE -1
end
and
f = h and
i = j
What am I doing wrong here?

case is an expression, not a predicate (i.e condition) : it 'returns' a typed value and can not contain predicate as result (in the then parts). In your case (assuming else -1 means 'no match') :
AND g = CASE strfldvar
WHEN 'BROKEN_ARROW' THEN x
WHEN 'BROKEN_BOX' THEN y
ELSE NULL -- never match, even if g is null
END
although I think it would be simpler to replace it with :
AND (
(strfldvar = 'BROKEN_ARROW' AND x = g)
OR (strfldvar = 'BROKEN_BOX' AND y = g)
)

Instead of
CASE strfldvar
WHEN 'BROKEN_ARROW' THEN (x = g)
WHEN 'BROKEN_BOX' THEN (y = g)
ELSE -1
have this:
x=CASE strfldvar WHEN 'BROKEN_ARROW' THEN g ELSE x END
y=CASE strfldvar WHEN 'BROKEN_ARROW' THEN g ELSE y END

I would replace
CASE strfldvar
WHEN 'BROKEN_ARROW' THEN (x = g)
WHEN 'BROKEN_BOX' THEN (y = g)
ELSE -1
by
(CASE WHEN strfldvar = 'BROKEN_ARROW' and x = g then 1
WHEN strfldvar = 'BROKEN_BOX' and y = g then 1
ELSE -1
END) = 1

Octave while/for statement -- what's wrong in a code?

This is my Octave code
for K= 1:10
while ( p < 1 )
ceil(log2(K)) + 1/(1-(1-p)^K) %function
p = p + sens;
K
endwhile;
endfor
K
and here is an output:
ans = 10.000
K = 1
ans = 5.0000
K = 1
ans = 3.3333
K = 1
ans = 2.5000
K = 1
ans = 2
K = 1
ans = 1.6667
K = 1
ans = 1.4286
K = 1
ans = 1.2500
K = 1
ans = 1.1111
K = 1
ans = 1
K = 1
K = 10
So, as you can see -- in inner while statement value of K is fixed to 1. What I am supposed to do to vary this value between 1 and 10. Why it is not working? I have no idea why this inner while statement is proceed only once.
ANSWER: There should be p= initial_value after for K=...

There should be p= initial_value after for K=...
That is, like this:
for K = 1:10
p = somevalue;
while ( p < 1 )
...