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An expression that is nullable can be turned into a nonnullable one by specifying ISNULL with the constant, where the constant is a nonnull value substituted for any NULL result.

REFERENCES permission on the type is required for computed columns based on common language runtime (CLR) user-defined type expressions.

ON can also be specified in a PRIMARY KEY or UNIQUE constraint. If is specified, the index is stored in the named filegroup.

If "default" is specified, or if ON is not specified at all, the index is stored in the same filegroup as the table.

Computed columns can be used in select lists, WHERE clauses, ORDER BY clauses, or any other locations in which regular expressions can be used, with the following exceptions: Based on the expressions that are used, the nullability of computed columns is determined automatically by the Database Engine.Thanks CREATE TABLE sample.taceledger ( `runno` INT(10) unsigned not null default '0', `doc_no` DECIMAL(6,0) unsigned NOT null , `doc_date` DATE, `gl` DECIMAL(4,0) unsigned not null , `slcode` VARCHAR(6) not null , `tr` VARCHAR(1) not null , `cr_db` VARCHAR(1) not null, `amount` DECIMAL(13,2)unsigned not null , `revcode` DECIMAL(4,0)unsigned not null , `narration` VARCHAR(30)unsigned not null, `cramt` DECIMAL(13,2) unsigned not null, `indi` VARCHAR(1)not null , `dbamt` DECIMAL(13,2) unsigned not null, `acctype` VARCHAR(1) unsigned not null, PRIMARY KEY (`runno`) )ENGINE=Inno DB; I am getting error #1064 on `indi` line I am unable to clear it can u find some solution I'm making a table with employees for a store.Only one employee can be the general manager for the store.SELECT * FROM example_timestamp; ---- -------------------------- --------------------- | id | data | cur_timestamp | ---- -------------------------- --------------------- | 1 | The time of creation is: | 2004-12-01 | ---- -------------------------- --------------------- 1 row in set (0.00 sec)mysql SELECT * FROM example_timestamp; ---- --------------------------- --------------------- | id | data | cur_timestamp | ---- --------------------------- --------------------- | 1 | The current timestamp is: | 2004-12-01 | ---- --------------------------- --------------------- 1 row in set (0.01 sec) retains its initial value and is not changed during subsequent updates.For versions prior to 4.1, the only workaround is to create two timestamp columns in a table, and explicitly set the second one when inserting the record.

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For more information, see Indexes on Computed Columns.

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