大约有 3,620 项符合查询结果（耗时：0.0204秒） [XML]
How to reset a single table in rails?
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To reset the index/primary key in SQLite just type:
$ rails console
> ActiveRecord::Base.connection.execute("DELETE from sqlite_sequence where name = 'yourtablename'")
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PostgreSQL query to list all table names?
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Documentation says only the current one: postgresql.org/docs/9.5/static/infoschema-tables.html "table_catalog sql_identifier Name of the database that contains the table (always the current database)"
– sudo
Sep 10 '16 at 5:53
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MySQL Orderby a number, Nulls last
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MySQL has an undocumented syntax to sort nulls last. Place a minus sign (-) before the column name and switch the ASC to DESC:
SELECT * FROM tablename WHERE visible=1 ORDER BY -position DESC, id DESC
It is essentially the i...
How to get database structure in MySQL via query
Is it possible to somehow get structure of MySQL database, or just some table with simple query?
10 Answers
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Using Kafka as a (CQRS) Eventstore. Good idea?
...l back-ends or stand-alone products, it is well-documented how to create a SQL-based event store. And there are libraries available on top of a various kinds databases. There is also EventStore, which is built for this purpose.
In distributed scenarios, I've seen a couple of different implementatio...
Difference between two dates in MySQL
... the time value can range from "-838:59:59" to "838:59:59". w3schools.com/SQl/func_mysql_timediff.asp
– cREcker
Aug 3 '17 at 12:21
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How to convert a List into a comma separated string without iterating List explicitly [dupli
...place(", ", ",");
// CSV format surrounded by single quote
// Useful for SQL IN QUERY
String csvWithQuote = ids.toString().replace("[", "'").replace("]", "'")
.replace(", ", "','");
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How can I stop a running MySQL query?
I connect to mysql from my Linux shell. Every now and then I run a SELECT query that is too big. It prints and prints and I already know this is not what I meant. I would like to stop the query.
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How to update column with null value
I am using mysql and need to update a column with a null value. I have tried this many different ways and the best I have gotten is an empty string.
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How to do this in Laravel, subquery where in
... ->where('active', 1)
->get();
generates the SQL
SELECT `id`, `name`, `img`, `safe_name`, `sku`, `productstatusid` FROM `products`
WHERE `id` IN (SELECT `product_id` FROM `product_category` WHERE
`category_id` IN (?, ?)) AND `active` = ?
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