I have stored procedure in MySql which user will pass in a number e.g. 'cr002149'
Now I want to increase the number by 1 for each record in select statment. How can I do that to let the number become e.g. cr002150,cr002151...
Thanks.
You should reconsider your data structure, you might get better luck just using an auto_increment'd integer. Either way, this should do.
CONCAT('cr',
LPAD(
CAST(
SUBSTRING('cr002149',3) AS DECIMAL(0)
)+1,
6,'0'
)
);
The above will return cr002150. First, we get 002149 using SUBSTRING, then cast the string 002149 to an integer and get 2149. Now, we increment this to get 2150, followed by left-padding it by 0s to get 002150, and finally we concatenate cr on the left side.
Related
Please look at my screenshots and help me to understand what I am missing.
What datatype should I choose for these columns in MYSQL? I keep getting mistakes in decimal datatype columns. I chose decimаl12,3 because no columns(revenue, product&purchase price) with currency have more than 12 digits in total, 9 before and 3 after the decimal point. Could someone help me to understand what data type to choose with examples?
if we have an integer number e.g. 85192 we choose int?
for currency we choose the decimal, right? then what have I done wrong that I keep getting errors? 0 records imported.
if we have a combination of numbers and letters or just letters then we choose varchar? and varchаr1 equals 1 character, eg. apple32 = 7 characters, therefore vаrchar7?
turning to decimal, 12,464.87 in total 7 digits, 5 before and 2 after the decimal point, hence mysql decimаl7,2 should be enough, right? or would it be better to put decimаl10,3 with a margin so to say.
excel
mysql
data
$1,000.00 contains two characters that cannot be part of a numeric literal: the dollar sign and the comma that is used as a thousands separator.
Find a way to change '$1,000.00' to '1000.00' in the input file. Then, the load will succeed.
Alternatively, create an intermediate table where product_price is a VARCHAR(32), load into that, and then:
INSERT INTO target_table
SELECT
other_col1
,other_col2
, ....
,CAST(REPLACE(REPLACE(product_price,',',''),'$','') AS DECIMAL(15,2)
,other_col_n
,...
FROM staging_table;
You don't need an intermediate table. When doing LOAD DATA, put and columns into #variables; then use a SET to convert as needed:
LOAD DATA
...
col1, col2, #price, ...,
SET price = CAST(REPLACE(REPLACE(product_price,',',''),'$','') AS DECIMAL(15,2))
Dates need to be like this: "2022-07-25 22:02:22". Either change what Excel is delivering, or use STR_TO_DATE(...) in the SET.
I have a MySQL table that looks like this:
id layer l_to blank
1 1 10 xyz
0 0 5.5 xyz
I want to get the highest number of column-variable "l_to" that shares column-variable "blank".
I have tried the following SQL-query:
SELECT MAX(l_to), COUNT(layer),l_from FROM layers WHERE blank='xyz'
This works fine, if "l_to" of layer 1 is below 10. If it is ten, the query returns "l_to" from layer 0 (5.5).
Any Idea for why this is, and how can I retrieve the MAX?
#EDIT: Changing Datatype of "l_to" from VARCHAR to DECIMAL (5,1) got me the desired result. Thanks for the answers!
The datatype is not a number for field l_to so 5 is greater than 1 for a string. Probably a varchar. Change field l_to to a Decimal [1].
Only consider casting if you do not have control over the table structure as best practice is the data type reflects the data use in the world. This protects the data integrity of the database, provides helpful functions related to the datatype and ensures intuitive outcomes, like Max function. Casting as a work around for this query will only lead to downstream issues; refactor the structure now if you can.
Reference
Decimal data type suggested in comments by #Akina. Originally suggested float, but Decimal appears to reflect the Use Case better than float, given the limited examples shown.
Cast l_to from string to decimal
SELECT MAX(cast(l_to as DECIMAL(10,2)), COUNT(layer) from FROM layers WHERE blank='xyz'
Use a LIMIT query, and also cast the l_to column to decimal:
SELECT *
FROM layers
WHERE blank = 'xyz'
ORDER BY CAST(l_to AS DECIMAL(12.4)) DESC
LIMIT 1;
I need to store phone numbers starting with 0 but whenever i try to store this in MySql table the starting ZERO is removed because no number start with Zero actually
how i can solve this problem please do i need to change the field type from Integer to another type
Try to change the datatype to unsigned-zerofill. Refer the manual.
or you can use the LPAD function as well like
SELECT LPAD( yourNumber, lengthOfYourNumber, '0')
I've inherited a database and am using views in MySQL to return specific information from a database. I'm having a little trouble one portion- turning the returned numeric value that is a decimal into a percentage.
I don't want to do this in the php- I am specifically trying to format everything in the view first. I realize this is not necessarily the way everyone does this, but for my specific situation it is the best overall solution.
The example value in the database: 0.46
What I'd like to have returned: 46%
Relevant portions of current query:
SELECT CONCAT(a.fa_rate, '%') as rate_percent
FROM accounts a;
This returns 0.46%. Is it possible to return the result I want to have without converting the number into a string? The current data type is a float.
try this
SELECT CONCAT(a.fa_rate * 100 , '%') as rate_percent
FROM accounts a;
Consider the string "55,33,255,66,55"
I am finding ways to count number of occurence of a specific characters ("55" in this case) in this string using mysql select query.
Currently i am using the below logic to count
select CAST((LENGTH("55,33,255,66,55") - LENGTH(REPLACE("55,33,255,66,55", "55", ""))) / LENGTH("55") AS UNSIGNED)
But the issue with this one is, it counts all occurence of 55 and the result is = 3,
but the desired output is = 2.
Is there any way i can make this work correct? please suggest.
NOTE : "55" is the input we are giving and consider the value "55,33,255,66,55" is from a database field.
Regards,
Balan
You want to match on ',55,', but there's the first and last position to worry about. You can use the trick of adding commas to the frot and back of the input to get around that:
select LENGTH('55,33,255,66,55') + 2 -
LENGTH(REPLACE(CONCAT(',', '55,33,255,66,55', ','), ',55,', 'xxx'))
Returns 2
I've used CONCAT to pre- and post-pend the commas (rather than adding a literal into the text) because I assume you'll be using this on a column not a literal.
Note also these improvements:
Removal of the cast - it is already numeric
By replacing with a string one less in length (ie ',55,' length 4 to 'xxx' length 3), the result doesn't need to be divided - it's already the correct result
2 is added to the length because of the two commas added front and back (no need to use CONCAT to calculate the pre-replace length)
Try this:
select CAST((LENGTH("55,33,255,66,55") + 2 - LENGTH(REPLACE(concat(",","55,33,255,66,55",","), ",55,", ",,"))) / LENGTH("55") AS UNSIGNED)
I would do an sub select in this sub select I would replace every 255 with some other unique signs and them count the new signs and the standing 55's.
If(row = '255') then '1337'
for example.