I have very little experience with SQL. I am stuck with seemingly very simple task – I've copied a row with contract numbers, which includes a two-digit year number (EG 1/14, 31/15, 221/17) into a new "year" row.
Now I need to replace the digits left from the forward slash and slash itself with '20' string to get pretty full year (EG 2014, 2015, 2017). The row is VARCHAR.
I was trying this:
UPDATE contracts SET year = REPLACE(year, '%/', '20')
or this:
UPDATE contracts SET year = REPLACE(year, '*/', '20')
Which did not throw error, but did not update anything (0 rows affected…).
I was trying even regexp, but this throws error, so obviously the syntax must be wrong:
UPDATE contracts SET year = REPLACE(year, '.+/\', '20')
Any help would be appreciated.
MySQL does not support regular expressions with replace(). Based on your sample data, you can do:
UPDATE contracts
SET year = CONCAT('20', SUBSTRING_INDEX(year, '/', -1))
Related
Query
Get the Joining year,Joining Month and Joining Date from employee table
This is my query which I have to perform. For this I write the following script:
select
SUBSTRING (convert(varchar,joining_date,103),7,4) ,
SUBSTRING (convert(varchar,joining_date,100),1,3) ,
SUBSTRING (convert(varchar,joining_date,100),5,2)
from
EMPLOYEE
The result is: http://d.pr/i/vObI
But when I changed convert(varchar,joining_date,100) to convert(varchar,joining_date,101)
Result is like this: http://d.pr/i/G5fZ
Can anyone please explain what this parameter means?
There are several different ways that you can format date using convert(varchar.... These are well documented on the MSDN site or different sites online.
Using convert(varchar..., date, 100) places the date in the format:
mon dd yyyy hh:mmAM (or PM)
May 10 2013 12:55PM
Using convert(varchar...date, 101) puts the date in the format:
mm/dd/yyyy
05/10/2013
See Demo
My suggestion would be whenever you implement these conversions, be sure to give a length on the varchar(10), etc.
Based on what it looks like you are returning, you can eliminate some of the convert/substring statements that you are using and implement some other functions to get the same result:
select year(joining_date) as [year] ,
convert(varchar(3),joining_date,100) as [month] ,
day(joining_date) as [day]
from EMPLOYEE
I think there is a better approach to split and get datetime parts using DATEPART:
select DATEPART(YEAR, [joining_date]),
DATEPART(MONTH, [joining_date]),
DATEPART(DAY, [joining_date]) from EMPLOYEE
or if you are interested for example in names use DATENAME:
select DATEPART(YEAR, [joining_date]),
DATENAME(MONTH, [joining_date]),
DATEPART(DAY, [joining_date]) from EMPLOYEE
However according to MSDN for DATENAME: "The return value depends on the language environment set by using SET LANGUAGE".
Regarding your initial question - these parameters are basically styles or I would call them Regional specific codes as described here, and you can just run the different queries against the DB and you will see the strings returned - and you will figure why you get unexpected results. For more infos refer to MSDN: CAST and CONVERT
It sounds more complicated than it actually is. Here is what I'm trying to do within the SELECT part:
SELECT TIMESTAMPADD(
UCASE(
SUBSTRING(offset_unit,1,CHAR_LENGTH(offset_unit)-1)
),1,'2003-01-02') as offset_date
offset_unit is a VARCHAR column in the database. It contains one of the following: "Hours","Minutes".
offset is an INT.
I am trying to convert the offset_unit to uppercase, after I have removed the last character ('s') so I can have a proper interval (MINUTE, HOUR...) so I can get a date that I can use in sorting afterwards, but MySQL keeps throwing an error. I have tested each step by adding one function at a time, and it only fails after I add TIMESTAMPADD. If I enter MINUTE manually then it works.
Any way to get this working?
Additional info: I am running this in CakePHP 1.3, in a find, within the 'fields' array, but that shouldn't be important.
this can be easily achived by using CASE WHEN clause as:
SELECT (CASE
WHEN offset_unit = 'HOURS'
THEN TIMESTAMPADD(HOUR,`offset`,'2003-01-02')
WHEN offset_unit = 'MINUTES'
THEN TIMESTAMPADD(MINUTE,`offset`,'2003-01-02')
END) AS offset_date
FROM my_table;
SEE SQLFIDDLE DEMO HERE
It doesn't work because TIMESTAMPADD does not take a string as the first argument, but a unit keyword, for example MINUTE. My guess is that you need to do this in two steps, first get the unit and then construct a query with the correct keyword.
I am executing this query
SELECT *
FROM temp
WHERE DATE_FORMAT(startTime,'%m/%d/%Y') = '7/15/2012'
and startTime column has this value '2012-07-15 12:00:00'
But this is not returning any results. Can somebody please help?
Change here:
7/15/2012
to:
07/15/2012
According to the documentation for the DATE_FORMAT function, %m is "Month, numeric (00..12)". Note the zero-padding. So you need to write '07/15/2012' rather than '7/15/2012'.
(And in case you're wondering — I have no idea what month #0 is. So far as I'm aware, the months range from 01 to 12. Maybe some locales do have a month #0?)
I have a field named 'SALARY ON' in which data(year-month) entered is in format '2012-01'(datatype varchar) in table named Table1.For creating a sp i need to take only 2012 from above mentioned table field. How can I do this.
Please help me to solve this.
In the simplest case, a 'SUBSTRING' and 'CAST' will do it for you:
SELECT CAST(SUBSTRING([SALARY ON], 1, 4) AS INT) FROM SALARY
This depends in the fact that the date has been entered in the format YYYY-MM. If you're checking this in a constraint, then the above sample will be fine. Otherwise, you'll need to do some pattern checking before you try to convert it:
SELECT CASE WHEN [SALARY ON] LIKE '[0-9][0-9][0-9][0-9]-[0-9][0-9]' THEN SUBSTRING([SALARY ON], 1, 4) AS INT) ELSE -1 END
You can then take all of the years returned as -1 and raise an error to the user, filter them out, write them to a log file, etc, depending on the environment in which the sp is being called.
I have a table I'm using as a source for an append query that calls upon a table query, which calls upon a union query to effectively adjust the eastern prevailing time to spring forward and fall back while converting to utc. there are only three fields in the table but I keep getting "access did not import .... due to type conversion". Please Help Me out!!! Thank you in advance
below is the access sql:
{append query}
INSERT INTO somePrice ( price )
SELECT DTQuery.Price
FROM DTQuery
WHERE (((DTQuery.EPT)<>[2ndsunday]));
{DTQuery}
SELECT
TransposeQuery.Field3 AS [Zone]
, DateSerial(Left([field1],4),Left(Right([field1],4),2),Right([field1],2))+[TransposeQuery]![Hour]/24 AS EPT, Val([Field8]) AS Price
, DateValue(DateSerial(Year([EPT]),3,14))-(Weekday(DateValue(DateSerial(Year([EPT]),3,14)),1)-1)+3/24 AS 2ndSunday
, DateValue(DateSerial(Year([EPT]),11,7))-(Weekday(DateValue(DateSerial(Year([EPT]),11,7)),1)-1)+3/24 AS 1stSunday
FROM TransposeQuery
ORDER BY
TransposeQuery.Field3
, DateSerial(Left([field1],4),Left(Right([field1],4),2),Right([field1],2))+[TransposeQuery]![Hour]/24, Val([Field8]);
First some general stuff: If you want to convert between timezones, which involves adding or subtracting a number of hours you might want to use to DateAdd function.
DateAdd("h", -2, [SourceDateTime])
This simply takes two hours off the SourceDateTime field.
Also rather than using the Left(Right( combination you can use Mid(string, start, length)
Mid("1234567890", 2, 4)
Returns 2345, but if you are dealing with dates just use DatePart
DatePart("h", "17/12/2011 08:10")
Returns 8.
As for the type conversion error, it's hard to say as you haven't given us the types of the fields in the destination table.
If you run the append query without the first line this will rule out the destination table. If it still fails then it might be in the where clause, so move the fields into the results set and make sure they are the same type. If it still fails then it must be in the source query so check DTQuery opens without any problems.