Recent questions tagged sql

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sql server 2008 - Update only time from my Datetime field in sql

I have a date 2013-12-14 05:00:00.000 in my table. Now i want to update only time of that date. E ... to update only time from datetime field? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - How can I reseed an identity column in a T-SQL table variable?

I have a T-SQL table variable (not a table) which has an auto incrementing identity column. I want to clear all ... 1. How can this be done? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - FileLoadException / Msg 10314 Error Running CLR Stored Procedure

Receiving the following error when attempting to run a CLR stored proc. Any help is much appreciated. ... Assembly.Load(String assemblyString) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - Select SQL results grouped by weeks

I want to select data from following table group by weeks Date Product Name Sale +----------+----- ... write SQL query to achieve this behavior! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Generating Random Number In Each Row In Oracle Query

I want to select all rows of a table followed by a random number between 1 to 9: select t.*, (select ... row to row in the same execution? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to get list of values in GROUP_BY clause?

If I have data like this in a table id data -- ---- 1 1 1 2 1 3 2 4 2 5 3 6 3 4 How do I get results like this in ... -- 1 1, 2, 3 2 4, 5 3 6, 4 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Trigger insert old values- values that was updated

I need to create trigger in SQL Server 2008 that gone insert all values from one row in which some value was changed ... I can do this? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - MySQL Nested Select Query?

Ok, so I have the following query: SELECT MIN(`date`), `player_name` FROM `player_playtime` GROUP BY `player_name` ... I go about doing this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - What is the difference between a primary key and a unique constraint?

Someone asked me this question on an interview... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - ON DELETE CASCADE in sqlite3

I have the following structure: (Sorry for awkward names, it is because it is a sqlite database for my iPhone app ... I delete a row in klb_log? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - SQL: Combine Select count(*) from multiple tables

How do you combine multiple select count(*) from different table into one return? I have a similar sitiuation as this ... I'm on MS SQL 2005 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to count number of occurrences for all different values in database column?

I have a Postgre database that has say 10 columns. The fifth column is called column5. There are 100 rows in ... is the command that does that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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730 views

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sql - MySQL Trigger - Storing a SELECT in a variable

I have a trigger in which I want to have a variable that holds an INT I get from a SELECT, so I ... declare/use variables in MySQL triggers? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How do you write a conditional in a MySQL select statement?

I'm using MySQL, and I want to do a sort of ternary statement in my SQL like: SELECT USER_ID, ((USER_ID ... etc. How does one accomplish this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to select all the columns of a table except one column?

How to select all the columns of a table except one column? I have nearly 259 columns I cant mention 258 columns in ... any other way to do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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318 views

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sql - Key/Value pairs in a database table

I need to design a Key/value table in my database and I'm looking for guidance on the best way to do this. ... 's the best way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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309 views

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sql server - SQL: Last_Value() returns wrong result (but First_Value() works fine)

I have a table in SQL Server 2012 as the snapshot shows: Then I'm using Last_Value() and First Value to get ... still cannot find the answer.... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How can I create a closure table using data from an adjacency list?

I have a database containing a hierarchy of categories stored using the adjacency list model. The hierarchy is 3 ... keys to Category.id. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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307 views

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sql server - How do I sort a linked list in sql?

I have implemented a linked list as a self-referencing database table: CREATE TABLE LinkedList( Id bigint NOT NULL, ... ORDER by SomeData :-) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Find all those columns which have only null values, in a MySQL table

The situation is as follows: I have a substantial number of tables, with each a substantial number of columns. ... without any filled in values. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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316 views

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sql - ORM performance cost

Does anyone have any experience that indicates what kind of performance hit a developer could expect by choosing ... really interesting to me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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275 views

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sql - MySQL join many to many single row

I have 3 tables that I want to combine, see below for details: product productID name price prod_cat productID ... would I got about this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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407 views

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sql server - Join to only the "latest" record with t-sql

I've got two tables. Table "B" has a one to many relationship with Table "A", which means that there ... any help would be greatly appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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381 views

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sql - Truncate all tables in MySQL database that match a name pattern

I need to clear all my inventory tables. I've tried this: SELECT 'TRUNCATE TABLE ' + TABLE_NAME FROM ... what am I doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - SQL Join on Nearest less than date

Normally I would just do this in the code itself, but I am curious if this can be accomplished efficiently in TSQL. ... to do this in the code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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336 views

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sql server - What is the meaning of "#" in front of a table name in TSQL?

what is the difference between the table names "#mytable" and "mytable" in TSQL? I see table names start with "#" in a lot of custom procedures. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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312 views

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sql - Truncate with condition

truncate ->this resets the entire table, is there a way via truncate to reset particular records/check conditions. ... inside the table. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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671 views

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sql - Oracle - Why does the leading zero of a number disappear when converting it TO_CHAR

In Oracle, when converting a number with a leading zero to a character, why does the leading number disappear? Is this ... /* Result = .56 */ See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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