rowcount

How to fetch the row count for all tables in a SQL SERVER database [duplicate]

由 徘徊边缘 提交于 2019-11-26 06:03:49
问题 This question already has an answer here: Query to list number of records in each table in a database 19 answers I am searching for a SQL Script that can be used to determine if there is any data (i.e. row count) in any of the tables of a given database. The idea is to re-incarnate the database in case there are any rows existing (in any of the database). The database being spoken of is Microsoft SQL SERVER . Could someone suggest a sample script? 回答1: The following SQL will get you the row

Get record counts for all tables in MySQL database

由 会有一股神秘感。 提交于 2019-11-26 03:25:48
问题 Is there a way to get the count of rows in all tables in a MySQL database without running a SELECT count() on each table? 回答1: SELECT SUM(TABLE_ROWS) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '{your_db}'; Note from the docs though: For InnoDB tables, the row count is only a rough estimate used in SQL optimization. You'll need to use COUNT(*) for exact counts (which is more expensive). 回答2: You can probably put something together with Tables table. I've never done it, but it looks

count number of rows in a data frame in R based on group [duplicate]

由 江枫思渺然 提交于 2019-11-26 01:54:50
This question already has an answer here: Count number of rows within each group 13 answers I have a data frame in R like this: ID MONTH-YEAR VALUE 110 JAN. 2012 1000 111 JAN. 2012 2000 . . . . 121 FEB. 2012 3000 131 FEB. 2012 4000 . . . . So, for each month of each year there are n rows and they can be in any order(mean they all are not in continuity and are at breaks). I want to calculate how many rows are there for each MONTH-YEAR i.e. how many rows are there for JAN. 2012, how many for FEB. 2012 and so on. Something like this: MONTH-YEAR NUMBER OF ROWS JAN. 2012 10 FEB. 2012 13 MAR. 2012 6

count number of rows in a data frame in R based on group [duplicate]

由 好久不见. 提交于 2019-11-26 01:54:03
问题 This question already has an answer here: Count number of rows within each group 13 answers I have a data frame in R like this: ID MONTH-YEAR VALUE 110 JAN. 2012 1000 111 JAN. 2012 2000 . . . . 121 FEB. 2012 3000 131 FEB. 2012 4000 . . . . So, for each month of each year there are n rows and they can be in any order(mean they all are not in continuity and are at breaks). I want to calculate how many rows are there for each MONTH-YEAR i.e. how many rows are there for JAN. 2012, how many for
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