database-design

问题 I need to a value associated to a month and a user in a table. And I want to perform queries on it. I don't know if there is a column data type for this type of need. If not, should I: Create a string field and build year-month concatenation (2017-01) Create a int field and build year-month concatenation (201701) Create two columns (one year and one month) Create a date column at the beginning of the month (2017-01-01 00:00:00) Something else? The objective is to run queries like (pseudo-SQL)

问题 I need to a value associated to a month and a user in a table. And I want to perform queries on it. I don't know if there is a column data type for this type of need. If not, should I: Create a string field and build year-month concatenation (2017-01) Create a int field and build year-month concatenation (201701) Create two columns (one year and one month) Create a date column at the beginning of the month (2017-01-01 00:00:00) Something else? The objective is to run queries like (pseudo-SQL)

问题 I need to a value associated to a month and a user in a table. And I want to perform queries on it. I don't know if there is a column data type for this type of need. If not, should I: Create a string field and build year-month concatenation (2017-01) Create a int field and build year-month concatenation (201701) Create two columns (one year and one month) Create a date column at the beginning of the month (2017-01-01 00:00:00) Something else? The objective is to run queries like (pseudo-SQL)

问题 I need to a value associated to a month and a user in a table. And I want to perform queries on it. I don't know if there is a column data type for this type of need. If not, should I: Create a string field and build year-month concatenation (2017-01) Create a int field and build year-month concatenation (201701) Create two columns (one year and one month) Create a date column at the beginning of the month (2017-01-01 00:00:00) Something else? The objective is to run queries like (pseudo-SQL)

问题 I need to a value associated to a month and a user in a table. And I want to perform queries on it. I don't know if there is a column data type for this type of need. If not, should I: Create a string field and build year-month concatenation (2017-01) Create a int field and build year-month concatenation (201701) Create two columns (one year and one month) Create a date column at the beginning of the month (2017-01-01 00:00:00) Something else? The objective is to run queries like (pseudo-SQL)

来源： https://stackoverflow.com/questions/47438535/understanding-arrow-tips-in-mysql-workbench-eer-diagram

来源： https://stackoverflow.com/questions/47438535/understanding-arrow-tips-in-mysql-workbench-eer-diagram

来源： https://stackoverflow.com/questions/33952849/use-1-junction-table-with-3-foreign-keys-or-2-junction-tables-with-shared-sequen

来源： https://stackoverflow.com/questions/63427197/sending-incremental-data-to-other-application-from-oracle-database-even-small

来源： https://stackoverflow.com/questions/63427197/sending-incremental-data-to-other-application-from-oracle-database-even-small