What is NULLIF() and How to Use it in PostgreSQL? It is a built-in function in Postgres that accepts a couple of arguments and retrieves a NULL value if both arguments are equal or if either of the specified arguments is NULL. It retrieves the first argument if both arguments are not...
PostgreSQL supports a TIMESTAMP data type that is used to store the DateTime values in the database. In PostgreSQL, “NULL” is used as the column’s default value, if no default value is explicitly declared. However, if a particular value is assigned as the column’s default value, ...
INSERTINTOdepartmentsvalues(30,'Sales',null,null); UPDATE Statement Using an UPDATE statement a user can modify an existing row. Syntax UPDATEtable_nameSETcolumn1 = value1, column2 = value2, ...WHEREcondition; Example 1 Modify a value department id to 50 for an employ...
#VALUE! error occurs when the specified serial number is not a valid Excel time. Frequently Asked Questions 1. How to Insert Current Time in Excel? Press CTRL + SHIFT + ; or use the NOW function. 2. How to Insert Current Static Date and Time in Excel? Press CTRL + ; and CTRL + ...
Insert NULL value into INT column, How to insert NULL in mysql especially INT dataType, MySQL - Cannot insert NULL value in column, but I have a default value specified?, How to insert NULL value from nodeJS/javascript to MySQL using parameterized inputs
Not NULL:This constraint does not allow us to insert NULL value in the column on which it is created UNIQUE:The UNIQUE constraint does not allow duplicate values to be inserted in the column CHECK: This constraint checks the value being inserted in a table. The check constraint has expression...
PostgreSQL IS NULL Introduction to PostgreSQL IS NULL PostgreSQL IS NULL is basically used to check or test the null values in an insert, update, delete, and select queries. We have used null when we want to check that a given value is null or not null; the given condition returns the ...
The next step is to create a trigger and tell it to call this function: 1 2 3 CREATETRIGGERxtrig BEFOREINSERTONt_temperature FOREACHROWEXECUTEPROCEDUREf_temp(); Our trigger will only fire on INSERT (shortly before it happens). What is also noteworthy here: In PostgreSQL, a trigger on a...
You can specify default values for function arguments by appending DEFAULT and the desired value to the argument declaration: CREATE OR REPLACE FUNCTION insert_delivery( site_id integer DEFAULT NULL, position_id integer DEFAULT NULL, tank_level numeric DEFAULT NULL, tank_volume ...
2. Insert data into table “sales”: postgres=# INSERT INTO sales VALUES (121,'paste',1000,10), (144,'brush',1500,20), (166,'soap',800,0), (178,'coffee',500,NULL); INSERT 0 4 3. If we try to perform subtract a value in the "discount" column from a value in the "amount...