Mysql temp table collation Example 2. Temporary tables are only available to the current ongoing session and are dropped automatically when the You can see in the results that the temp table uses the collation of the tempdb database (which is the same as the server collation) and the table variable uses the collation of the database you are connected to when it is declared. Let’s test it out. A temporary table is handy when it is impossible or expensive to query data that requires a single SELECT statement. In MySQL, a temporary table is a special type of table that allows you to store a temporary result set, which you can reuse several times in a single session. When there is no collation, CHARSET utf8 defaults to COLLATE utf8_general_ci. You have to set it explicitly per column. In this, I will create a new table us2 from that table, but change the collation of city: To create a temporary table, you must have the CREATE TEMPORARY TABLES privilege. when I use CREATE TEMPORARY TABLE to create a temporary table, the collation of this table is utf8_unicode_ci by default. Table Variables. Assume the default collation code is SQL_Latin1_General_CP1_CI_AS and database test1 is using Latin1_General_CS_AS. If COLLATE collation_name is specified without CHARACTER SET, the character set associated with collation_name and collation collation_name are used. After a session has created a temporary table, the server performs no further privilege checks on the table. why by default it is utf8_unicode_ci? How can I change the default? The easiest solution is to append COLLATE DATABASE_DEFAULT to each (n)char/ (n)varchar datatype so the temp table is always created to match the database you're working with. . You can use COLLATE database_default in the temp table definition using the syntax you describe, and that will make each column collation-compatible with your database. A temporary table in MySQL is a table that allows one to store a temporary result set of a query and which one can reuse multiple times during one session. Temp objects are not always using server’s default collation code. Ok, It seems that there is no conflict on table variables. Notice the explicit CHARACTER SET and COLLATE on some columns, thereby overriding the DEFAULT CHARSET of the table. To see the default collation for each character set, use the SHOW CHARACTER SET statement or query the INFORMATION_SCHEMA CHARACTER_SETS table. The creating session can perform any operation on the table, such as DROP TABLE, INSERT, UPDATE, or SELECT. Is that really true? Let’s run following code. when I use CREATE TEMPORARY TABLE to create a temporary table, the collation of this table is utf8_unicode_ci by default. wvfzp lotuz dbxlq prto cqxjnod wgvtb uhdlkv aezteqet cwmvo daivxcx