Note that the first parameter should always be the greater value that is a recent date and the second one should be older and smaller value. So he/she was 23 years 4 months and 6 days old on the 1st of June 2019 if the birth date is 26th of January 1996. Then we can find out the result using the following query statement – Let us find how old was that person on 1st of June 2019 i.e ‘’. So that person is 24 years 2 months and 12 days old. Then we will use the following query statement to find the same. We have to find out how old is that person. Let us find out with the help of an example, how it works?Ĭonsider a particular date, for example, “” is the birth date of someone. If two parameters are specified then the difference between both of them is given in days months and years format. We can even find out the age of the person in terms of days, months, and years from the specified date until today if only one parameter is specified in the AGE() method. There is a difference of 6 days between today’s date “” and “”. Let us consider an example,įiring the above query statement results in the following output – We can find the difference between two dates by simply subtracing one from the other using the minus operator (-). SELECT TO_CHAR(CURRENT_DATE, 'mm/dd/yyyy') SELECT TO_CHAR(CURRENT_DATE, 'FMDay, FMDD') Now, if I just want to display the day and date without month and year in it.
SELECT TO_CHAR(CURRENT_DATE, 'Day, dd yyyy') įiring the above statement gives the following output – We can prepare our query statement for the same in the following way –
For specifying today’s date, we will use the CURRENT_DATE variable. The first template is today’s day and then after a comma the date and year to be displayed. Let us see some of the examples of TO_CHAR() method implementations – The first parameter is the date that we want to convert to a certain format and the second parameter is the template of the target format in which we want the date value to be displayed. TO_CHAR(datetobeConverted, targetTemplate) Īs shown above, the TO_CHAR method accepts two parameters. The following is the syntax of TO_CHAR method – We can get the dates in the format we want by converting the default format value of date present in yyyy-mm-dd to another format we wish to by using to_char function. We can use:: double colons to retrieve only the date part from the above output along with date keyword in the following way – If we fire the SELECT NOW() command it will result in –
#Best gui for postgres 2019 full#
Now() function retrieves the full string of current date and time. We can either use the CURRENT_DATE variable and select its value of use Now() function to retrieve the current date and i,e and further to only retrieve date use Now():: date to retrieve current date value in PostgreSQL in the following way –
Now let us see some of the date-related functions that are available in PostgreSQL for date retrieval and manipulation. This is because we have mentioned the starting_date column of DATE datatype and having the default value of CURRENT_DATE that is the date at the movement when the record will be inserted according to the database server on which the value is inserted. We can see that today’s date i.e 7th of April 2020 is inserted as the value in the starting_date column of our table even when we haven’t mentioned it while inserting the record. Let us now check the contents of our table educba by firing the following SELECT command – SELECT * FROM educba INSERT INTO educba(technology_name, course_duration, department) VALUES ('psql',35,'Database') Let us insert the value in the educba table without mentioning the starting_date column’s value while inserting.
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Let us create a table named educba containing date column in it.ĬREATE TABLE educba (technical_id serial PRIMARY KEY,technology_name VARCHAR (255) NOT NULL,course_Duration INTEGER,starting_date DATE NOT NULL DEFAULT CURRENT_DATE,department VARCHAR(100)) įiring the above query in our psql terminal command prompt will result in the following output – Hadoop, Data Science, Statistics & others
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