insert-update

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best practice for maintaining ranking tables?

Using MySQL and PHP, I have a simple ranking table with 2 columns user and score. Once a week, I re-run the ranking script and it computes scores for each user.[详细]

2023-01-16 22:13 分类：问答
In MySQL, how do I insert only when row doesn't exist and update only when existing version is less

I am looking for a way to only insert when the row does not exist in MySQL, and update when the row exists AND the version of the existing row is less than (or equal to) the version of the new row.[详细]

2023-01-16 04:58 分类：问答
Converting INSERT commands to UPDATE

I have two INSERT commands, that are useless to me like that because the two sets of rows - the ones that are already in the table, and the ones I have as INSERT commands - are not disjunct. Both comm[详细]

2023-01-16 00:09 分类：问答
How to get the original value of changed fields?

I\'m using sqlalchemy as my orm, and use declarative as Base. Base = declarative_base() class User(Base):[详细]

2023-01-15 09:26 分类：问答
MySQL INSERT INTO Statement

I need some help with an insert statement. I\'ve got: my_table_a: SchoolLatitudeLongitude Old School38.6...-90.990...[详细]

2023-01-09 09:50 分类：问答
INSERT ... SELECT, WHERE

I have two tables, one called countries and one called country.Countries has bot开发者_如何学Goh countries and states, but no ISO for the countries.The country table has the country names with ISO, bu[详细]

2023-01-08 21:34 分类：问答
Update the value of a field in database by 1 using codeigniter

I want to implement a SQL statement using codeigniter active record. UPDATE tags SET usage = usage+1开发者_C百科 WHERE tag=\"java\";[详细]

2023-01-08 13:33 分类：问答
Is it possible to use the Sql MERGE syntax to UPDATE / INSERT data from another variable TABLE?

I wish to Insert or Update a row in a table - so I wish to try and use the MERGE syntax. My problem is that my data (to insert/update) exists in a variable table. I\'m not sure how to write the correc[详细]

2023-01-05 04:09 分类：问答
How to create select SQL statement that would produce "merged" dataset from two tables(Oracle DBMS)?

Here\'s my original question: merging two data sets Unfortunately I omitted some intircacies, that I\'d like to elaborate here.[详细]

2023-01-02 09:09 分类：问答
Linq2Sql - attempting to update but the Set statement in sql is empty

This is weird ... done updates loads of times before but cannot spot why this is different. although I am using .net 4.0 now - however i doubt its a bug in its L2S implementation. Its not like this is[详细]

2022-12-30 07:28 分类：问答