If you have successfully created the table, you can see the table you have created as shown below. Note: There are other options or variables available while you create a table, like setting primary or foreign key. But for the sake simplicity, we kept those options out of the scope of t...
CREATE OR REPLACE FUNCTION "public"."f_inittables1"(arr _text)RETURNS "pg_catalog"."void" AS $BODY$DECLAREscount INTEGER;rownum integer := 1;currsnum text;strSQL text;BEGINscount:=array_length(arr,1);while rownum <= scount LOOPcurrsnum:=arr[rownum];RAISE NOTICE '这里是%', currsnum...
直观起见我们依旧通过举例说明,下面通过CREATE TABLE LIKE来完成复制:create table t_key_event_file_student_101 (like t_key_event_file_student); 复制成功后再看一下表结构的DDL语句和数据: 如上图,同CREATE TABLE AS不同的是这次复制成功拷贝了所有NOT-NULL约束,并且没有拷贝表数据,这也渐渐...
postgres=# 创建表 创建表之前要连接指定的数据库 \c test; CREATETABLEtable_name( column1 datatype, column2 datatype, column3 datatype, ... columnN datatype,PRIMARYKEY(oneormore columns ) ); 写法1: test=#createtablecompany(idintprimarykeynotnull, name textnotnull, ageintnotnull,addresschar...
E:\>psql -U postgres -f TestDb1.sql TestDb2 >a.txt 2>&1 不转储权限选项:-x E:\>pg_dump -U postgres -x -s -f TestDb12.sql TestDb1 TestDb12.sql比TestDb1.sql少了一下几行: 为了可以多次运行TestDb1.sql,可以在文件开始加以下两行: ...
CREATEORREPLACEFUNCTION"public"."f_inittables1"(arr _text) RETURNS"pg_catalog"."void"AS$BODY$DECLAREscountINTEGER; rownuminteger:=1; currsnumtext; strSQLtext; BEGIN scount:=array_length(arr,1);whilerownum <= scountLOOPcurrsnum:=arr[rownum]; ...
EDB Postgres Advanced Server allows you to create rowids on a foreign table by specifying either theWITH (ROWIDS)orWITH (ROWIDS=true)option in theCREATE FOREIGN TABLEsyntax. Specifying theWITH (ROWIDS)orWITH (ROWIDS=true)option adds a rowid column to a foreign table. For informati...
zinteger);INSERTINTOtbl(x)SELECTxFROMgenerate_series(1,5)ASt(x);ALTERTABLEtblADDCOLUMNyinteger;CREATEORREPLACEFUNCTIONcopy_to_new_column()RETURNSTRIGGERAS$BODY$BEGININSERTINTOtbl(y)VALUES(NEW.x+1);RETURNnew;END; $BODY$languageplpgsql;CREATEORREPLACETRIGGERtrig_copy_to_new ...
当主从复制采用 binlog 的行模式时,如果从库启用 slow_query_log、log_slow_replica_statements 且从库重放 CREATE TABLE、DROP TABLE 时因特殊情况(比如被从库其他 SQL 占用 MDL 锁)执行耗时较长,会被从库记录到慢日志(slow log),而 ALTER TABLE 却不会被记录到慢日志。
postgres数据库添加boolean <-> smallint的自动转换逻辑 -- 创建函数1 smallint到boolean到转换函数 ...