SET Datatype PerformancePosted by: Juan Fernandez Date: April 21, 2005 06:38AM I have a “little” performance problem using the SET datatype. I have a database with over 800,000 rows which have 34 columns which are enum(‘0’,’1’) to describe various categories. So when I ...
In MySQL, when you store a number in a SET column, the bits set in the binary representation of that number determine which set members are included in the column value. Consider the following query for a better understanding −Create table test_table ( ID int auto_increment primary key ...
变量的声明 在MySQL存储过程中,我们也可以使用DECLARE语句来声明一个变量。与SET语句不同,DECLARE语句用于在存储过程的开头定义变量,其格式如下: DECLAREvar_name datatype; 1. 其中var_name是变量的名称,datatype是变量的数据类型。下面是一个示例,演示如何在存储过程中声明一个变量: DELIMITER//CREATEPROCEDUREexample...
I found out the following, using a mysql 5.7 server: -> If you make a new table and use the DOUBLE datatype, without entering anything into the length field, the column gets correctly set up with the DOUBLE datatype. -> afterwards, the table is shown with 22,0 in the length field,...
SeeSection 13.3.1, “String Data Type Syntax”forSETtype syntax and length limits. When retrieved, values stored in aSETcolumn are displayed using the lettercase that was used in the column definition. Note thatSETcolumns can be assigned a character set and collation. For binary or case-sensit...
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### Error querying database. Cause: org.apache.ibatis.executor.result.ResultMapException: Error attempting to get column 'type' from result set. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLDataException: '255' in column '4' is outside valid range for the datatype TINYINT. ...
IN 'Backup.mdb' FROM Persons 1. 2. 3. 4. 上面的操作,可以在最后添加 where 子句,也能使用 join 从一个以上的表中选取数据。 10.create database 语句 CREATE DATABASE 用于创建数据库。 CREATE DATABASE database_naem 1. 11.create table 语句 ...
### Error querying database. Cause: org.apache.ibatis.executor.result.ResultMapException: Error attempting to get column 'type' from result set. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLDataException: '255' in column '4' is outside valid range for the datatype TINYINT. ...
---+ 6 rows in set (0.08 sec) Any reason for this? Ric. Windows: "Where do you want to go today?" Linux: "Where do you want to go tomorrow?" FreeBSD: "Are you guys coming, or what?" Subject Written By Posted I set a text datatype, mysql says 'mediumText' Frederick...