topic Re: matching previous day data in App Development

matching previous day data

bhaskar1986 — Thu, 22 May 2025 19:23:00 GMT

Hi,

Below is the matching with combination of id to id & previous date data where we have to display null values.

trying below syntax in script

if(peek(id)<>id and peek(num(date)) <> num(date) as flag.

can you please help and thank in advance

Re: matching previous day data

RafaelBarrios — Fri, 23 May 2025 07:26:22 GMT

Hi @bhaskar1986
not really sure what your are trying to achieve here.

but consider that peek will give you the previously loaded row in a table. So, my guess is that you need to sort your table by id and date and then use the peek or previous

something like this:

loaded_data:

load * inline [

id,date

101, 1/1/2025

102, 1/2/2025

103, 1/3/2025

104, 1/4/2025

105, 1/5/2025

106, 1/6/2025

107, 1/7/2025

108, 1/8/2025

109, 1/9/2025

110, 1/10/2025

111, 1/11/2025

112, 1/12/2025

113, 1/13/2025

101, 1/11/2025

102, 1/12/2025

103, 1/13/2025

104, 12/1/2024

105, 12/2/2024

106, 12/3/2024

107, 12/4/2024

108, 12/5/2024

109, 12/6/2024

110, 12/7/2024

];

load

if(peek(id)<>id and peek(num(date)) <> num(date),<do something>,<do something else>) as flag

RESIDENT loaded_data

ORDER BY id asc,date asc; //so you read all dates by id and then move to next id

drop table loaded_data;

you could use preceding load to make simpler

take a look on peek and previous

https://community.qlik.com/t5/Design/Peek-vs-Previous-When-to-Use-Each/ba-p/1475913

Best,

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Re: matching previous day data

Qrishna — Sun, 25 May 2025 21:35:00 GMT

can you please be clear of what you trying to do here? are you comparing curent id to previous id and date with previous date, if they are not same display null?

Re: matching previous day data

bhaskar1986 — Tue, 27 May 2025 02:25:32 GMT

matching current date id with previous id date and last written by order by but some how values not getting null values.

Re: matching previous day data

Qrishna — Tue, 27 May 2025 17:38:31 GMT

try: if(id=previous(id) and date=previous(date), 1) as flag.