Entity integrity: the primary key constraint
Domain integrity
Referential integrity: foreign key constraints
SELECT constraint_name, constraint_type FROM user_constriants WHERE table_name='EMP';
4.1, range partitioning
According to the table for a column or group of columns in a range of values that determine which partition, the data is stored in the
For example: the sales table sales_cost column value partition
The CREATE TABLE sales
(
.
)
PARTTION BY RANGE (sales_cost)
(
PARTTION P1 VALUES LESS THAN (1000),
PARTTION P2 VALUES LESS THAN (2000),
PARTTION P3 VALUES LESS THAN (3000),
PARTTION P4 VALUES LESS THAN (MAXVALUE)/* more THAN 3000 other VALUES are stored in the partition P4 */
);
First look at SwipeRefreshLayout use, very easy to use and have a look at the layout file
[HTML] view plain copy in CODE view CODE to my CODE derived pills
<? The XML version="1.0" encoding="utf-8"?>XMLNS: tools="http://schemas.android.com/tools"
The android: id="@ + id/swiperefresh"
Android: layout_width="match_parent"
Android: layout_height="match_parent"
Tools: context="cj.com.recyclerviewdemo.RecyclerViewActivity" & gt;The android: id="@ + id/my_recycler_view"
Android: layout_width="match_parent"
Android: layout_height="wrap_content"/& gt;
CodePudding user response:
The building Lord why this is,Oracle and android;
CodePudding user response:
LZ do learning summary, and share learning outcomes?