大约有 3,610 项符合查询结果(耗时:0.0144秒) [XML]

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Remove the last character from a string [duplicate]

...issue where I didn't want to remove the last characters but a word from an SQL string at the END of the string only like " AND ", so I used this with substr("sqlstatement", 0, -7); to remove the last AND in the sequence of WHERE AND clauses I was writing. Worked like a charm :). ...
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Set the value of a variable with the result of a command in a Windows batch file

...re's how I do it when I need a database query's results in my batch file: sqlplus -S schema/schema@db @query.sql> __query.tmp set /p result=<__query.tmp del __query.tmp The key is in line 2: "set /p" sets the value of "result" to the value of the first line (only) in "__query.tmp" via the "...
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What is the dual table in Oracle?

...esults, such as sysdate. Also helps you to check if Oracle is up and check sql syntax, etc. share | improve this answer | follow | ...
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How can I check whether a option already exist in select by JQuery

...o input sanitization, and you end up with code practices that have haunted SQL for decades. So a -1 is completely unwarranted. The question even states that they want to insert values "dynamically". Don't patch your string together dynamically. You also don't do 'select 1 from users where password="...
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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...
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Pandas count(distinct) equivalent

...am using pandas as a db substitute as I have multiple databases (oracle, mssql, etc) and I am unable to make a sequence of commands to a SQL equivalent. ...
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How to reset a single table in rails?

... To reset the index/primary key in SQLite just type: $ rails console > ActiveRecord::Base.connection.execute("DELETE from sqlite_sequence where name = 'yourtablename'") share ...
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PostgreSQL query to list all table names?

... 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

... 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...
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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 ...