SHOW GLOBAL VARIABLES; 1. 查看会话变量【不写session默认就是会话变量】 SHOW SESSION VARIABLES; 1. 查看满足条件的部分变量 使用like SHOW GLOBAL VARIABLES LIKE '%char%'; 1. 查看指定的某个系统变量的值 # SELECT @@系统变量名 SELECT @@character_set_system SELECT @@global.character_set_system 1. ...
MySQL 8.0: 在性能优化和语法上进行了一些改进,支持JSON等新数据类型,能更好地与DECLARE结合使用。 使用分类图表示声明的对象 为了更好理解DECLARE语句所支持的内容,我们可以通过类图来表示。下面的图展示了DECLARE所声明的不同对象类型及其关系: declarescontainsusesStoredProcedure+DECLARE variables+DECLARE handlers+DECLA...
Re: 17.2.7.1. DECLARE Local VariablesPosted by: David Ashman Date: January 29, 2008 06:12PM CREATE PROCEDURE discount( IN itemID INT, IN discount_percent INT, OUT discount_price DECIMAL(8,2) ) BEGIN DECLARE temp_price DECIMAL(8,2); SELECT item_price FROM item_list WHERE id = item...
Local variables are treated like stored routine parameters with respect to data type and overflow checking. SeeSection 15.1.17, “CREATE PROCEDURE and CREATE FUNCTION Statements”. Variable declarations must appear before cursor or handler declarations. ...
Local variables are treated like stored routine parameters with respect to data type and overflow checking. SeeSection 13.1.16, “CREATE PROCEDURE and CREATE FUNCTION Statements”. Variable declarations must appear before cursor or handler declarations. ...
You can also assign the same value to multiple variables in one line:Example int x, y, z; x = y = z = 50; System.out.println(x + y + z); Try it Yourself » Exercise? Which of the following declares multiple variables of the same type? int x = 1, y = 2, z = 3; int...
Another way to use %ROWTYPE in PostgreSQL variables is using RECORD as the data type of a variable. Below is the same example as above, but displaying “emp” table data using RECORD type. postgres=#CREATEPROCEDUREexample4 ()AS$$ postgres$#DECLAREpostgres$# eid_var emp.eid%TYPE;postgres$...
SETsyntax for variable assignment enables you to assign values to different types of variables that affect the operation of the server or clients: System variables. SeeSection 6.1.5, “Server System Variables”. System variables also can be set at server startup, as described inSection 6.1.6,...
SETsyntax for variable assignment enables you to assign values to different types of variables that affect the operation of the server or clients: System variables. SeeSection 6.1.5, “Server System Variables”. System variables also can be set at server startup, as described inSection 6.1.6,...
The documentation lacks an examples on how local variables would be used. Can anyone refer me to an example, and preferably not one using a command line tool. I do my queries using phpmyadmin and the unfortunate mysql query browser which I hate but that's what we have at work....