create-table

Can I create a new table with an old table's autoincriment status in mysql client? I think, that ALTER TABLE new_table_name AUTO_INCREMENT=@my_autoincr_iment helps me, but this construction must use with a constant value. I don't want to use a difficult script. mysql> create table new_table like old_table; mysql> select @my_auto_increment:=auto_increment from information_schema.tables where table_name='old_table'; mysql> set @query = CONCAT("alter table new_table auto_increment = ", @my_auto_increment); mysql> prepare stmt from @query; mysql> execute stmt; mysql> deallocate prepare stmt; Thx

I'm trying to create a table in mysql with a foreign key reference, like this: In database A: CREATE TABLE replication ( id varchar(255) NOT NULL PRIMARY KEY, uid varchar(255) NOT NULL, value int(11) NOT NULL, FOREIGN KEY (uid) REFERENCES databaseB.users(username) ); In database B i have a table named users like this: +-----------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------+--------------+------+-----+---------+-------+ | id | varchar(255) | NO | | NULL | | | username | varchar(255) | NO | PRI | NULL | | +-------------

Is it possible to store the result of a prepared table in mysql ? My use case is - : I am creating two variables based on certain conditions of the source table, then fetching the randomized rows, based on this criteria. Since I have 10 of such tables, should I be 1st joining them and then doing this randomization on the "overall" passing/filtering criteria (See also @total below, which is my main criteria, PER table) set @total=(select count(*) from tab_1 where predict_var ="4" or predict_var ="2" ) ; set @sample= ( select @total*(70/30)) ; PREPARE STMT FROM " SELECT * FROM tab_1 WHERE

I want to create a new table and set a date type with a specific format. Is that possible? For example: CREATE TABLE User ( ... EXPIRATION DATE " YYYY/MM" ... ) Erwin Brandstetter I suggest a different approach: Never store date / time as character type ( text , varchar() , ...) to begin with. Use an appropriate type , probably date in your case. Also, never use reserved words as identifier. user is just not possible to begin with, you would have to double-quote, which I would discourage. Could look like this: CREATE TABLE usr ( usr_id serial PRIMARY KEY ,usr text UNIQUE ,expiration_date date

I'm using HSQLDB for persisting a small data, in my query I want to create tables at first time and if they are not exist anymore. However with HSQLDB I cannot execute the query "CREATE TABLE XYS IF NOT EXISTS" like other dbms like mysql or mssql. Please give me solution for this case. HSQLDB supports the syntax like the example below: CREATE TABLE IF NOT EXISTS xyx (a int, b varchar(10)) The syntax is supported by recent HSQLDB 2.3.X versions. 来源： https://stackoverflow.com/questions/21814489/how-to-create-table-if-not-exists-with-hsqldb