Recent questions tagged SQL

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sql - MySQL SELECT AS combine two columns into one

Using this solution, I tried to use COALESCE as part of a MySQL query that outputs to a csv file using ... Contact_Phone from within the query? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to check any missing number from a series of numbers?

I am doing a project creating an admission system for a college; the technologies are Java and Oracle. In one ... find the solution in Oracle. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Pass In "WHERE" parameters to PostgreSQL View?

I have a rather complicated query on my PostgreSQL database spanning 4 tables via a series of nested subqueries. ... by percent symbols above. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - PostgreSQL: Case insensitive string comparison

Is there a simple ignore-case-comparison for PostgreSQL? I want to replace: SELECT id, user_name FROM users WHERE lower( ... ), but not on sets. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to use multiple WITH statements in one PostgreSQL query?

I would like to "declare" what are effectively multiple TEMP tables using the WITH statement. The query I am ... unable to find an answer. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Import Excel Data into PostgreSQL 9.3

I've developed a huge table in excel and now facing problem in transferring it into the postgresql database. I' ... advance for all the helps! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - SQL recursive query that gets all ancestors of an item

ID parent_id name --------------------- 1 2 first 2 4 second 3 3 third 4 5 fourth 5 - fifth Ancestors list of first should be (2, 4, 5) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server 2005 - Calculate execution time of a SQL query?

I am providing search functionality in my website, when user searches a record then I want to display the time the ... 'm using SQL Server 2005. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - T-SQL: How to Select Values in Value List that are NOT IN the Table?

I have a list of e-mail addresses, some of them are in my table, some of them are not. I want to ... Exist email4 | Exist Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - SELECT INTO in MySQL

I am a MSSQL user and now I am converting my database to MySQL. I am writing the following query in ... should be properly written in MySQL? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - converting int to real in sqlite

Division in sqlite return integer value sqlite> select totalUsers/totalBids from (select (select count(*) from ... value of division result? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How do I remove the first characters of a specific column in a table?

In SQL, how can I remove the first 4 characters of values of a specific column in a table? Column name is ... for all records Please guide me See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Rails query through association limited to most recent record?

class User has_many :books I need a query that returns: Users whose most recent book has :complete => true. i. ... I am expecting many. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to restore PostgreSQL dump file into Postgres databases?

I have a dump file with a .SQL extension (in fact it is a plain-text SQL file). I want to restore ... /restoring database from an SQL file. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - sql primary key and index

Say I have an ID row (int) in a database set as the primary key. If I query off the ID often do ... harm to additionally index the primary key? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How do I find a default constraint using INFORMATION_SCHEMA?

I'm trying to test if a given default constraint exists. I don't want to use the sysobjects table, but the ... by the name of the constraint. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - What's best SQL datatype for storing JSON string?

What's the best SQL datatype for storing JSON string? static List<ProductModel> CreateProductList() { string json = ... ? TEXT? VARBINARY(MAX)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - Comparing two bitmasks in SQL to see if any of the bits match

Is there a way of comparing two bitmasks in Transact-SQL to see if any of the bits match? I've got ... Programmer 4 Designer Any ideas? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to replace specific values in a oracle database column?

I am looking to replace values in a particular column. For example the following column values column name --- ... -- Trest1 Test2 Test3 Trest12 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - What does collation mean?

What does collation mean in SQL, and what does it do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Difference between filtering queries in JOIN and WHERE?

In SQL I am trying to filter results based on an ID and wondering if there is any logical difference between ... exact same two result sets) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Can SQLite handle 90 million records?

Or should I use a different hammer to fix this problem. I've got a very simple use-case for storing data, ... Failed to close db" ); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - When should I use stored procedures?

When should I be using stored procedures instead of just writing the logic directly in my application? I'd like to ... of in reference to this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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488 views

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sql - To ignore duplicate keys during 'copy from' in postgresql

I have to dump large amount of data from file to a table PostgreSQL. I know it does not support 'Ignore' ' ... a java program, if it helps See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Is it possible to insert data into a MySQL view?

I made a MySQL view with 4 tables. Is it possible to insert data into the view and have MySQL automatically pass the data into the right table? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - What's the difference between a Table Scan and a Clustered Index Scan?

Since both a Table Scan and a Clustered Index Scan essentially scan all records in the table, why is a ... 'SomeVal' select * from @temp See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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585 views

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sql - PostgreSQL: how to convert from Unix epoch to date?

The statement gives me the date and time. How could I modify the statement so that it returns only the date (and not ... AS bigint ) / 1000 ) ); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Copy a table (including indexes) in postgres

I have a postgres table. I need to delete some data from it. I was going to create a temporary table, ... TABLE .. LIKE X INCLUDING INDEXES' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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