how to add a column whose name is a value from another table?? for ex: i've a value for empid:1001 in employee table and i need to add a column in temp table with a column named 1001!!! my actual objective is to add a new column to temp whenever a value is added to ...
1 row in set, 1 warning (0.00 sec) A conclusionfrom this is we want smallerprimary keys if possible. ’s this table accordingly 1 2 3 mysql> alter tablet1 drop primarykey, column idint primarykey autoincrement; QueryOK, 0 rows affected(16.66 sec) Records: 0 Duplicates...
The reason for this is that the anonymous-user account has a more specific Host column value than the 'finley'@'%' account and thus comes earlier in the user table sort order. (For information about user table sorting, see Section 4.5, “Access Control, Stage 1: Connection Verification”....
Bug #45724Adding a column returns an unhandled exception. Submitted:24 Jun 2009 18:33Modified:24 Jul 2009 20:36 Reporter:Paul WarrenEmail Updates: Status:No FeedbackImpact on me: None Category:MySQL WorkbenchSeverity:S3 (Non-critical)
PressingTaborEnterwhile the cursor is in the table name field selects theColumnstab of the table editor and creates a default column namedidinvoice. PressingTaborEnteragain sets the focus on theDatatypelist withINTselected. Notice that a field has been added to the table on the EER canvas. ...
to add another unique column to act as the primary key. The internal GEN_CLUST_INDEX one is not exposed to the upper MySQL layer, and only theInnoDB engine is aware of it, hence it is useless for replication speed. Therefore, an explicit PK is always a better solution. However, if...
While the potential alterations made to the schema of a table in Google BigQuery are fairly limited, there are a essentially two types of changes you are allowed to perform. You may add a new NULLABLE or REPEATED column, or you may alter an existing column’s mode (from REQUIRED to ...
I have a MySQL db, and one of the tables has a JSON blob in it, with a virtual column generated from that JSON content. CREATE TABLE `my_table` ( `name` varchar(50) NOT NULL, `json` json DEFAULT NULL, `virtual_column` bigint(20) GENERATED ALWAYS AS (json_unquote(json_extract(`...
In my environment I have a table with around 5 million records and two indexes. I want to know what will be the effect on the existing indexes, if i add a new column to this table i.e. whether indexes are dropped and created again or updated somehow or there is no effect at al...
What is the procedure for adding a column to an existing table? Do I 1) Just add the column and no data will be lost? 2) Export the table and data, change the code to initialize the new columns correctly, and then import the table? My dump from MySQL Workbench contains the values ...