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24 paź 2014 · I would like to convert a datetime field to varchar so I can show a blank or a message when the date is NULL. This is what I have so far: select isnull(us.Date,0) as USDate, isnull(au.Date,0) as A...
SQL Server comes with the following data types for storing a date or a date/time value in the database: DATE - format YYYY-MM-DD. DATETIME - format: YYYY-MM-DD HH:MI:SS. SMALLDATETIME - format: YYYY-MM-DD HH:MI:SS. TIMESTAMP - format: a unique number.
19 maj 2021 · This article will explain what problems can occur when working with SQL NULL values and it also gives some solution recommendations to overcome these issues. What is a SQL NULL value? In terms of the relational database model, a NULL value indicates an unknown value.
4 sty 2011 · NULL means absence of value (i.e. there is no value), while empty string means there is a string value of zero length. For example, say you have a table to store a person' data and it contains a Gender column. You can save the values as 'Male' or 'Female'.
Example. Try this code » -- Syntax for MySQL Database . CREATE TABLE users ( id INT(4) NOT NULL PRIMARY KEY AUTO_INCREMENT, name VARCHAR(50) NOT NULL UNIQUE, birth_date DATE NOT NULL, created_at DATETIME DEFAULT CURRENT_TIMESTAMP, updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP. );
understanding SQL commands. Recall that searching the database for information to display involves the SELECT command. It also involves the PHP functions mysql_query and mysql_fetch_array. Here’s how it works: $SQL = “SELECT * FROM tableName WHERE fieldname = ‘foo’”; $allValues = mysql_query($SQL, $linkID);
if(is_null($date1)){ $date1 = 'NULL'; } If you are using a MySQL date column, you must also specify that it should hold null when creating it, like this: CREATE TABLE `table` ( id INT NOT NULL AUTO_INCREMENT, date DATE NULL DEFAULT NULL, PRIMARY KEY(id) )
