database-table

how to copy top 1000 records from 7000 records in existing table to other new table

由 亡梦爱人 提交于 2019-12-12 01:42:16
问题 I have a table A which consists more than 7k records,Now i am creating a new table B .In my new table B I need to copy only 1000 records from table A which has more than 7000 records. No condition applies, it may be any thousand records from 7000 . 回答1: In SQL Server SELECT top 1000 * INTO newTableName FROM oldTableName; In MySQL SELECT * INTO newTableName FROM oldTableName Limit 1000; 回答2: INSERT INTO TABLEB(Col1, Col2, .... colN) SELECT TOP 1000 Col1, Col2, .... colN FROM TABLEA 回答3: You

SQL: Foreign Key With multiple child values

由 梦想与她 提交于 2019-12-11 17:52:48
问题 How would I setup a groups table with following relationship with a list of user: For example, lets say I have table of users: user_list ----------------------------------- first_name | Last Name | user_id | ----------------------------------- john | Appleseed | 4 | Jasmin | Applejuice | 6 | Now I want to create a groups table. How can I create a table where users can be included in a group, or multiple groups. For example, John is included in the Apple_group but also included in the Orage

Compare columns in CSV with columns in database table in JAVA

由 纵饮孤独 提交于 2019-12-11 07:36:50
问题 I have a CSV with 44 columns and I have a table with 21 columns. Need to check of the columns in CSV along with the data matches with columns and data in database table I have created 2 class (one with main) where I have read the CSV file and stored the values in Key - Value pair. I have another class where I am executing select query to get the result. Now, got stuck with how should I be comparing these 2 things based on columns and its data Expected: No of columns in csv along with data

MySQL > Table doesn't exist. But it does (or it should)

由 拥有回忆 提交于 2019-12-11 06:03:42
问题 I changed the datadir of a MySQL installation and all the bases moved correctly except for one. I can connect and USE the database. SHOW TABLES also returns me all the tables correctly, and the files of each table exists on the MySQL data directory. However, when I try to SELECT something from the table, I get an error message that the table does not exist. Yet, this does not make sense since I was able to show the same table through SHOW TABLES statement. My guess is that SHOW TABLES lists

One table column for many fk tables?

由 断了今生、忘了曾经 提交于 2019-12-10 23:37:00
问题 What is the best solution/practice for situation like this? I have a table, that can reference to multiple tables (objects)? Here is an example for a table UserCalendar. It's a table where user saves his event, but also system inserts in this table from behind. User executes some services, which have deadlines and those are inserted in this table also. Problem is that there is no such a table as UserEvent table. User should save all his events in this calendar as description. I should make

How can I delete the contents of all tables in my database in phpMyAdmin without dropping the database?

由 痞子三分冷 提交于 2019-12-09 15:05:15
问题 How can I empty the contents of all tables in my database in phpMyAdmin without dropping any of the tables in the database? Since I do this several times an hour while in development, I'd rather not individually click "Empty" on all 60+ tables every time. 回答1: Create a SQL script with multiple DELETE statements (one for each table) and execute it. Get into phpMyAdmin and select the database that you want. Select the SQL tab and paste the SQL script into the window. Hit Go. Look here too: Drop

Duplicate a Row Based on a Condition SQL

由 吃可爱长大的小学妹 提交于 2019-12-05 02:05:11
问题 I have a table that looks like this +-------+------+------+----------+ | Index | F1 | F2 | Multiply | +-------+------+------+----------+ | 0 | LG | SC | 1 | | 1 | WE | CC | 1 | | 2 | TY | PL | 2 | +-------+------+------+----------+ And I want to multiply the 'Multiply' Column by 2 to determine how many rows to add to the result. With the example above, I want my SQL Query to return: +------+-----+-----+ |Index | F1 | F2 | +------+-----+-----+ | 0 | LG | SC | | 0 | LG | SC | | 1 | WE | CC | |

Qt4: Print a SQL table to PDF

由 风格不统一 提交于 2019-12-04 12:15:19
Qt has built-in PDF export support ( QPrinter::PdfFormat ). What's the best way to print an SQL table to a PDF file? (a table from a database loaded with QSqlDatabase and linked to a QTableView )... You use QWidget::render. See the documentation about Printing Widgets . 来源： https://stackoverflow.com/questions/5939491/qt4-print-a-sql-table-to-pdf

How can I delete the contents of all tables in my database in phpMyAdmin without dropping the database?

由 Deadly 提交于 2019-12-04 01:09:24
How can I empty the contents of all tables in my database in phpMyAdmin without dropping any of the tables in the database? Since I do this several times an hour while in development, I'd rather not individually click "Empty" on all 60+ tables every time. Create a SQL script with multiple DELETE statements (one for each table) and execute it. Get into phpMyAdmin and select the database that you want. Select the SQL tab and paste the SQL script into the window. Hit Go. Look here too: Drop all tables from a MySQL Database without deletion IMHO the easiest solution is: In phpmyadmin select the

Duplicate a Row Based on a Condition SQL

由 谁都会走 提交于 2019-12-03 16:37:16
I have a table that looks like this +-------+------+------+----------+ | Index | F1 | F2 | Multiply | +-------+------+------+----------+ | 0 | LG | SC | 1 | | 1 | WE | CC | 1 | | 2 | TY | PL | 2 | +-------+------+------+----------+ And I want to multiply the 'Multiply' Column by 2 to determine how many rows to add to the result. With the example above, I want my SQL Query to return: +------+-----+-----+ |Index | F1 | F2 | +------+-----+-----+ | 0 | LG | SC | | 0 | LG | SC | | 1 | WE | CC | | 1 | WE | CC | | 2 | TY | PL | | 2 | TY | PL | | 2 | TY | PL | | 2 | TY | PL | +------+-----+-----+ I
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