How to set variable from a SQL query? - Stack Overflow
To ASSIGN variables using a SQL select the best practice is as shown below. ->DECLARE co_id INT ; ->DECLARE sname VARCHAR(10) ; ->SELECT course_id INTO co_id FROM course_details ; ->SELECT student_name INTO sname FROM course_details;
database - MySQL enum vs. set - Stack Overflow
2013年2月10日 · When you define a SET('R', 'W', 'X') then you can INSERT an empty string, or one or more of these values. If you insert something that's not in the predefined set, an empty string is is inserted instead. Note that before inserting all duplicate values are discarded, so only one instance of each permitted value is being inserted. Hope this ...
INSERT INTO SET syntax in SQL Server - Stack Overflow
2011年8月7日 · The SET way to insert records is not standard SQL. If you need it to use similar sql's for updates and inserts, you should use Stored-Procedures in MS SQL-Server instead, for example: If you need it to use similar sql's for updates and inserts, you should use Stored-Procedures in MS SQL-Server instead, for example:
How do I declare and assign a variable on a single line in SQL
Here goes: DECLARE @var nvarchar(max) = 'Man''s best friend'; You will note that the ' is escaped by doubling it to ''. Since the string delimiter is ' and not ", there is no need to escape ": DECLARE @var nvarchar(max) = '"My Name is Luca" is a great song'; The second example in the MSDN page on DECLARE shows the correct syntax.
How do I perform an IF...THEN in an SQL SELECT?
2008年9月15日 · So for example if a product is obsolete but you dont know if product is instock then you dont know if product is saleable. You can write this three-valued logic as follows: SELECT CASE. WHEN obsolete = 'N' OR instock = 'Y' THEN 'true'. WHEN NOT (obsolete = 'N' OR instock = 'Y') THEN 'false'. ELSE NULL. END AS saleable.
How do I UPDATE from a SELECT in SQL Server? - Stack Overflow
2010年2月25日 · update uno set col1=d.col1,col2=d.col2 from uno. inner join dos d on uid=did where [sql]='cool'. select * from uno. select * from dos. If the ID column name is the same in both tables then just put the table name before the table to be updated and use an alias for the selected table, i.e.:
When or Why to use a "SET DEFINE OFF" in Oracle Database
2015年12月17日 · If you know your script includes (or may include) data containing '&' characters, and you do not want the substitution behaviour as above, then use set define off to switch off the behaviour while running the script: SQL> set define off. SQL> insert into customers (customer_name) values ('Marks & Spencers Ltd'); 1 row created.
sql server - What does "+=" mean in T-SQL - Stack Overflow
2012年8月16日 · 1. += (Addition Assignment) : Adds two numbers and sets a value to the result of the operation. For example, if a variable @x equals 35, then @x += 2 takes the original value of @x, add 2 and sets @x to that new value (37) += (String Concatenation Assignment) : Concatenates two strings and sets the string to the result of the operation.
sql - SET NOCOUNT ON usage - Stack Overflow
2011年7月22日 · 93. When SET NOCOUNT is ON, the count (indicating the number of rows affected by a Transact-SQL statement) is not returned. When SET NOCOUNT is OFF, the count is returned. It is used with any SELECT, INSERT, UPDATE, DELETE statement. The setting of SET NOCOUNT is set at execute or run time and not at parse time.
How do you use variables in a simple PostgreSQL script?
2009年4月20日 · 16. Here's an example of using a variable in plpgsql: create table test (id int); insert into test values (1); insert into test values (2); insert into test values (3); create function test_fn() returns int as $$. declare val int := 2; begin.