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Concatenation of fieldvalue and fieldname (handling of NULL)

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1

I'm relatively new to QGIS and I want to tackle the problem below.

Let's say I have a trench contraining two types of ducts
Number of ducts can range

I have created two fields for said trench. (Type 1 and Type 2)

The values in each field are the numbers of each type of duct that the trench contains.

I would like to label it something like this (eg lets say that trench contains 2 ducts of type one and one duct of type 2)

Label: 2xType1,Type2

Also, what can i do if one of the values is NULL ?

In that case ( lets say type1 is NULL) I would like the label to be
Label:Type2

I am looking for a compact solution since the actual number of duct types is 5

qgis null concatenation

share|improve this question

edited 3 hours ago

Vince

14.7k32749

asked 4 hours ago

SundrawSundraw

61

New contributor

Sundraw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  What have you tried? You should be able to use the coalesce function in a label expression to hande nulls
  
  – BERA
  3 hours ago
  
  
  

  
  
  
  

add a comment | 

1

I'm relatively new to QGIS and I want to tackle the problem below.

Let's say I have a trench contraining two types of ducts
Number of ducts can range

I have created two fields for said trench. (Type 1 and Type 2)

The values in each field are the numbers of each type of duct that the trench contains.

I would like to label it something like this (eg lets say that trench contains 2 ducts of type one and one duct of type 2)

Label: 2xType1,Type2

Also, what can i do if one of the values is NULL ?

In that case ( lets say type1 is NULL) I would like the label to be
Label:Type2

I am looking for a compact solution since the actual number of duct types is 5

qgis null concatenation

share|improve this question

edited 3 hours ago

Vince

14.7k32749

asked 4 hours ago

SundrawSundraw

61

New contributor

Sundraw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  What have you tried? You should be able to use the coalesce function in a label expression to hande nulls
  
  – BERA
  3 hours ago
  
  
  

  
  
  
  

add a comment | 

I'm relatively new to QGIS and I want to tackle the problem below.

Let's say I have a trench contraining two types of ducts
Number of ducts can range

I have created two fields for said trench. (Type 1 and Type 2)

The values in each field are the numbers of each type of duct that the trench contains.

I would like to label it something like this (eg lets say that trench contains 2 ducts of type one and one duct of type 2)

Label: 2xType1,Type2

Also, what can i do if one of the values is NULL ?

In that case ( lets say type1 is NULL) I would like the label to be
Label:Type2

I am looking for a compact solution since the actual number of duct types is 5

qgis null concatenation

share|improve this question

edited 3 hours ago

Vince

14.7k32749

asked 4 hours ago

SundrawSundraw

61

New contributor

Sundraw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 3 hours ago

Vince

14.7k32749

asked 4 hours ago

SundrawSundraw

61

New contributor

Sundraw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 3 hours ago

Vince

14.7k32749

asked 4 hours ago

SundrawSundraw

61

New contributor

Sundraw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 3 hours ago

Vince

14.7k32749

edited 3 hours ago

Vince

14.7k32749

asked 4 hours ago

SundrawSundraw

61

New contributor

Sundraw is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 hours ago

SundrawSundraw

61

1 Answer
1

active

oldest

votes

3

Maybe use something like the following:

replace(

if("id" > 0 and "id_1" > 0, "id" || 'x Type1, ' || "id_1" || 'x Type2', 

if("id" = 0 or "id" IS NULL, "id_1" || 'x Type2', 

if("id_1" = 0 or "id_1" IS NULL, "id" || 'x Type1', ''))), '1x', '')

share|improve this answer

answered 3 hours ago

JosephJoseph

57.5k7100197

add a comment | 

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3

Maybe use something like the following:

replace(

if("id" > 0 and "id_1" > 0, "id" || 'x Type1, ' || "id_1" || 'x Type2', 

if("id" = 0 or "id" IS NULL, "id_1" || 'x Type2', 

if("id_1" = 0 or "id_1" IS NULL, "id" || 'x Type1', ''))), '1x', '')

share|improve this answer

answered 3 hours ago

JosephJoseph

57.5k7100197

add a comment | 

3

Maybe use something like the following:

replace(

if("id" > 0 and "id_1" > 0, "id" || 'x Type1, ' || "id_1" || 'x Type2', 

if("id" = 0 or "id" IS NULL, "id_1" || 'x Type2', 

if("id_1" = 0 or "id_1" IS NULL, "id" || 'x Type1', ''))), '1x', '')

share|improve this answer

answered 3 hours ago

JosephJoseph

57.5k7100197

add a comment | 

Maybe use something like the following:

replace(

if("id" > 0 and "id_1" > 0, "id" || 'x Type1, ' || "id_1" || 'x Type2', 

if("id" = 0 or "id" IS NULL, "id_1" || 'x Type2', 

if("id_1" = 0 or "id_1" IS NULL, "id" || 'x Type1', ''))), '1x', '')

share|improve this answer

answered 3 hours ago

JosephJoseph

57.5k7100197

replace(

if("id" > 0 and "id_1" > 0, "id" || 'x Type1, ' || "id_1" || 'x Type2', 

if("id" = 0 or "id" IS NULL, "id_1" || 'x Type2', 

if("id_1" = 0 or "id_1" IS NULL, "id" || 'x Type1', ''))), '1x', '')

share|improve this answer

answered 3 hours ago

JosephJoseph

57.5k7100197

answered 3 hours ago

JosephJoseph

57.5k7100197

answered 3 hours ago

JosephJoseph

57.5k7100197