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sql - MySQL SELECT only not null values - Stack Overflow SELECT * FROM ( SELECT col1 AS col FROM yourtable UNION SELECT col2 AS col FROM yourtable UNION -- UNION SELECT coln AS col FROM yourtable ) T1 WHERE col IS NOT NULL And I agre with Martin that if you need to do this then you should probably change your database design
What does it mean `SELECT 1 FROM table`? - Stack Overflow SELECT * FROM TABLE1 T1 WHERE EXISTS ( SELECT 1 FROM TABLE2 T2 WHERE T1 ID= T2 ID ); Basically, the above will return everything from table 1 which has a corresponding ID from table 2 (This is a contrived example, obviously, but I believe it conveys the idea
How do I make a placeholder for a select box? - Stack Overflow <select> <option value="">Select your option< option> <option value="hurr">Durr< option> < select> But the 'Select your option' is in black instead of lightgrey So my solution could possibly be CSS-based jQuery is fine too This only makes the option grey in the dropdown (so after clicking the arrow): option:first { color: #999; }
How do I perform an IF. . . THEN in an SQL SELECT? The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server SELECT CAST( CASE WHEN Obsolete = 'N' or InStock = 'Y' THEN 1 ELSE 0 END AS bit) as Saleable, * FROM Product
sql - Insert into . . . values ( SELECT . . . FROM . . . - Stack Overflow This can be done without specifying the columns in the INSERT INTO part if you are supplying values for all columns in the SELECT part Let's say table1 has two columns This query should work: INSERT INTO table1 SELECT col1, col2 FROM table2 This WOULD NOT work (value for col2 is not specified): INSERT INTO table1 SELECT col1 FROM table2
How to programatically select an HTML option using JavaScript? In case you are using mySelect value = myOptionValue as per the accepted answer, but it still doesn't seem to work, then make sure that by the time you call your code the select options are fully rendered and interactive — if you are calling your code on page load, but it is not invoked via something like window onload, DOMContentLoaded, qjuery's ready() or whatever is used in your env then
How to select a drop-down menu value with Selenium using Python? After creating the instance of Select class, you can perform select methods on that instance to select the options from dropdown list Here is the code from selenium webdriver support select import Select select_fr = Select(driver find_element_by_id("fruits01")) select_fr select_by_index(0)
sql - Case in Select Statement - Stack Overflow Using a SELECT statement with a searched CASE expression Within a SELECT statement, the searched CASE expression allows for values to be replaced in the result set based on comparison values The following example displays the list price as a text comment based on the price range for a product